21011001212100 has 72 divisors (see below), whose sum is σ = 60796983132928. Its totient is φ = 5602458729600.

The previous prime is 21011001212029. The next prime is 21011001212129. The reversal of 21011001212100 is 121210011012.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 583917 + ... + 6508683.

Almost surely, 2^{21011001212100} is an apocalyptic number.

21011001212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011001212100 is an abundant number, since it is smaller than the sum of its proper divisors (39785981920828).

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

21011001212100 is a wasteful number, since it uses less digits than its factorization.

21011001212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5936605 (or 5936598 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21011001212100 its reverse (121210011012), we get a palindrome (21132211223112).

The spelling of 21011001212100 in words is "twenty-one trillion, eleven billion, one million, two hundred twelve thousand, one hundred".