21120222100 has 36 divisors (see below), whose sum is σ = 46275864544. Its totient is φ = 8366064480.

The previous prime is 21120222043. The next prime is 21120222133. The reversal of 21120222100 is 122202112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1014954 + ... + 1035553.

Almost surely, 2^21120222100 is an apocalyptic number.

21120222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120222100 is an abundant number, since it is smaller than the sum of its proper divisors (25155642444).

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

21120222100 is a wasteful number, since it uses less digits than its factorization.

21120222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050624 (or 2050617 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21120222100 its reverse (122202112), we get a palindrome (21242424212).

The spelling of 21120222100 in words is "twenty-one billion, one hundred twenty million, two hundred twenty-two thousand, one hundred".