21021000110000 has 100 divisors (see below), whose sum is σ = 55520665781064. Its totient is φ = 7644000000000.

The previous prime is 21021000109981. The next prime is 21021000110051. The reversal of 21021000110000 is 1100012012.

It is a tau number, because it is divible by the number of its divisors (100).

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21021000110000.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 95440001 + ... + 95660000.

Almost surely, 2^{21021000110000} is an apocalyptic number.

21021000110000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021000110000 is an abundant number, since it is smaller than the sum of its proper divisors (34499665671064).

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

21021000110000 is a wasteful number, since it uses less digits than its factorization.

21021000110000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191100040 (or 191100019 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21021000110000 its reverse (1100012012), we get a palindrome (21022100122012).

The spelling of 21021000110000 in words is "twenty-one trillion, twenty-one billion, one hundred ten thousand".