21120222012100 has 36 divisors (see below), whose sum is σ = 45831414351744. Its totient is φ = 8447990632480.

The previous prime is 21120222012041. The next prime is 21120222012107. The reversal of 21120222012100 is 121022202112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21120222012107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7747797 + ... + 10112803.

It is an arithmetic number, because the mean of its divisors is an integer number (1273094843104).

Almost surely, 2^{21120222012100} is an apocalyptic number.

21120222012100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120222012100 is an abundant number, since it is smaller than the sum of its proper divisors (24711192339644).

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

21120222012100 is a wasteful number, since it uses less digits than its factorization.

21120222012100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2454324 (or 2454317 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21120222012100 its reverse (121022202112), we get a palindrome (21241244214212).

The spelling of 21120222012100 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-two million, twelve thousand, one hundred".