21120021120100 has 36 divisors (see below), whose sum is σ = 52377652379584. Its totient is φ = 7241150098080.

The previous prime is 21120021120089. The next prime is 21120021120103. The reversal of 21120021120100 is 102112002112.

It is a super-2 number, since 2×21120021120100² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21120021120103) 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, 15085728672 + ... + 15085730071.

Almost surely, 2^{21120021120100} is an apocalyptic number.

21120021120100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120021120100 is an abundant number, since it is smaller than the sum of its proper divisors (31257631259484).

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

21120021120100 is a wasteful number, since it uses less digits than its factorization.

21120021120100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30171458764 (or 30171458757 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21120021120100 its reverse (102112002112), we get a palindrome (21222133122212).

The spelling of 21120021120100 in words is "twenty-one trillion, one hundred twenty billion, twenty-one million, one hundred twenty thousand, one hundred".