110101220021 has 6 divisors (see below), whose sum is σ = 119222031330. Its totient is φ = 101631895248.

The previous prime is 110101220017. The next prime is 110101220057. The reversal of 110101220021 is 120022101011.

It can be written as a sum of positive squares in 3 ways, for example, as 11058835921 + 99042384100 = 105161^2 + 314710^2 .

It is not a de Polignac number, because 110101220021 - 2² = 110101220017 is a prime.

It is a super-2 number, since 2×110101220021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 110101219984 and 110101220011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (110101220221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 325743086 + ... + 325743423.

It is an arithmetic number, because the mean of its divisors is an integer number (19870338555).

Almost surely, 2^110101220021 is an apocalyptic number.

It is an amenable number.

110101220021 is a deficient number, since it is larger than the sum of its proper divisors (9120811309).

110101220021 is an equidigital number, since it uses as much as digits as its factorization.

110101220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651486535 (or 651486522 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 110101220021 its reverse (120022101011), we get a palindrome (230123321032).

The spelling of 110101220021 in words is "one hundred ten billion, one hundred one million, two hundred twenty thousand, twenty-one".