21010111201000 has 32 divisors (see below), whose sum is σ = 49163660212680. Its totient is φ = 8404044480000.

The previous prime is 21010111200997. The next prime is 21010111201033. The reversal of 21010111201000 is 10211101012.

It can be written as a sum of positive squares in 4 ways, for example, as 2414300655204 + 18595810545796 = 1553802^2 + 4312286^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10505054601 + ... + 10505056600.

Almost surely, 2^{21010111201000} is an apocalyptic number.

21010111201000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010111201000 is an abundant number, since it is smaller than the sum of its proper divisors (28153549011680).

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

21010111201000 is a wasteful number, since it uses less digits than its factorization.

21010111201000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21010111222 (or 21010111208 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21010111201000 its reverse (10211101012), we get a palindrome (21020322302012).

The spelling of 21010111201000 in words is "twenty-one trillion, ten billion, one hundred eleven million, two hundred one thousand".