21101022000 has 120 divisors (see below), whose sum is σ = 73698899040. Its totient is φ = 5626934400.

The previous prime is 21101021987. The next prime is 21101022011. The reversal of 21101022000 is 22010112.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (9).

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, 568140 + ... + 604139.

It is an arithmetic number, because the mean of its divisors is an integer number (614157492).

Almost surely, 2^21101022000 is an apocalyptic number.

21101022000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101022000 is an abundant number, since it is smaller than the sum of its proper divisors (52597877040).

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

21101022000 is a wasteful number, since it uses less digits than its factorization.

21101022000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172308 (or 1172289 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21101022000 its reverse (22010112), we get a palindrome (21123032112).

The spelling of 21101022000 in words is "twenty-one billion, one hundred one million, twenty-two thousand".