21120001202100 has 72 divisors (see below), whose sum is σ = 62758749551008. Its totient is φ = 5479784092800.

The previous prime is 21120001202029. The next prime is 21120001202117. The reversal of 21120001202100 is 120210002112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 951340306 + ... + 951362505.

Almost surely, 2^{21120001202100} is an apocalyptic number.

21120001202100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120001202100 is an abundant number, since it is smaller than the sum of its proper divisors (41638748348908).

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

21120001202100 is a wasteful number, since it uses less digits than its factorization.

21120001202100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1902702865 (or 1902702858 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21120001202100 its reverse (120210002112), we get a palindrome (21240211204212).

The spelling of 21120001202100 in words is "twenty-one trillion, one hundred twenty billion, one million, two hundred two thousand, one hundred".