21102120101000 has 32 divisors (see below), whose sum is σ = 49378961038680. Its totient is φ = 8440848040000.

The previous prime is 21102120100993. The next prime is 21102120101003. The reversal of 21102120101000 is 10102120112.

It can be written as a sum of positive squares in 4 ways, for example, as 11875701700996 + 9226418400004 = 3446114^2 + 3037502^2 .

It is not an unprimeable number, because it can be changed into a prime (21102120101003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10551059051 + ... + 10551061050.

Almost surely, 2^{21102120101000} is an apocalyptic number.

21102120101000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102120101000 is an abundant number, since it is smaller than the sum of its proper divisors (28276840937680).

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

21102120101000 is a wasteful number, since it uses less digits than its factorization.

21102120101000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21102120122 (or 21102120108 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21102120101000 its reverse (10102120112), we get a palindrome (21112222221112).

The spelling of 21102120101000 in words is "twenty-one trillion, one hundred two billion, one hundred twenty million, one hundred one thousand".