21021111231000 has 64 divisors (see below), whose sum is σ = 65585867050080. Its totient is φ = 5605629660800.

The previous prime is 21021111230981. The next prime is 21021111231013. The reversal of 21021111231000 is 13211112012.

It is a super-2 number, since 2×21021111231000² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3503515539 + ... + 3503521538.

Almost surely, 2^{21021111231000} is an apocalyptic number.

21021111231000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021111231000 is an abundant number, since it is smaller than the sum of its proper divisors (44564755819080).

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

21021111231000 is a wasteful number, since it uses less digits than its factorization.

21021111231000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7007037101 (or 7007037087 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21021111231000 its reverse (13211112012), we get a palindrome (21034322343012).

The spelling of 21021111231000 in words is "twenty-one trillion, twenty-one billion, one hundred eleven million, two hundred thirty-one thousand".