221110100020 has 12 divisors (see below), whose sum is σ = 464331210084. Its totient is φ = 88444040000.

The previous prime is 221110100017. The next prime is 221110100023. The reversal of 221110100020 is 20001011122.

It is an interprime number because it is at equal distance from previous prime (221110100017) and next prime (221110100023).

It can be written as a sum of positive squares in 2 ways, for example, as 103760005924 + 117350094096 = 322118^2 + 342564^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221110100023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5527752481 + ... + 5527752520.

It is an arithmetic number, because the mean of its divisors is an integer number (38694267507).

Almost surely, 2^221110100020 is an apocalyptic number.

221110100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221110100020 is an abundant number, since it is smaller than the sum of its proper divisors (243221110064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221110100020 is a wasteful number, since it uses less digits than its factorization.

221110100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11055505010 (or 11055505008 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 221110100020 its reverse (20001011122), we get a palindrome (241111111142).

The spelling of 221110100020 in words is "two hundred twenty-one billion, one hundred ten million, one hundred thousand, twenty".