21111023131000 has 256 divisors, whose sum is σ = 54789948720000. Its totient is φ = 7549657600000.

The previous prime is 21111023130961. The next prime is 21111023131019. The reversal of 21111023131000 is 13132011112.

It is a happy number.

It is a super-2 number, since 2×21111023131000² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 165475236 + ... + 165602764.

Almost surely, 2^{21111023131000} is an apocalyptic number.

21111023131000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21111023131000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27394974360000).

21111023131000 is an abundant number, since it is smaller than the sum of its proper divisors (33678925589000).

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

21111023131000 is a wasteful number, since it uses less digits than its factorization.

21111023131000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127811 (or 127797 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21111023131000 its reverse (13132011112), we get a palindrome (21124155142112).

The spelling of 21111023131000 in words is "twenty-one trillion, one hundred eleven billion, twenty-three million, one hundred thirty-one thousand".