21021200122100 has 72 divisors (see below), whose sum is σ = 48760267768128. Its totient is φ = 7846725779200.

The previous prime is 21021200122079. The next prime is 21021200122121. The reversal of 21021200122100 is 122100212012.

It is an interprime number because it is at equal distance from previous prime (21021200122079) and next prime (21021200122121).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111364874 + ... + 111553473.

It is an arithmetic number, because the mean of its divisors is an integer number (677225941224).

Almost surely, 2^{21021200122100} is an apocalyptic number.

21021200122100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021200122100 is an abundant number, since it is smaller than the sum of its proper divisors (27739067646028).

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

21021200122100 is a wasteful number, since it uses less digits than its factorization.

21021200122100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222918425 (or 222918418 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21021200122100 its reverse (122100212012), we get a palindrome (21143300334112).

The spelling of 21021200122100 in words is "twenty-one trillion, twenty-one billion, two hundred million, one hundred twenty-two thousand, one hundred".