21203021311100 has 72 divisors (see below), whose sum is σ = 47713504213200. Its totient is φ = 8168731200000.

The previous prime is 21203021311097. The next prime is 21203021311133. The reversal of 21203021311100 is 111312030212.

It is a super-2 number, since 2×21203021311100² (a number of 27 digits) contains 22 as substring.

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, 7752026 + ... + 10124225.

Almost surely, 2^{21203021311100} is an apocalyptic number.

21203021311100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21203021311100 is an abundant number, since it is smaller than the sum of its proper divisors (26510482902100).

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

21203021311100 is a wasteful number, since it uses less digits than its factorization.

21203021311100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17876703 (or 17876696 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21203021311100 its reverse (111312030212), we get a palindrome (21314333341312).

The spelling of 21203021311100 in words is "twenty-one trillion, two hundred three billion, twenty-one million, three hundred eleven thousand, one hundred".