21001000022010 has 40 divisors (see below), whose sum is σ = 56469355616916. Its totient is φ = 5600266672320.

The previous prime is 21001000021997. The next prime is 21001000022029. The reversal of 21001000022010 is 1022000010012.

It can be written as a sum of positive squares in 2 ways, for example, as 18741098151801 + 2259901870209 = 4329099^2 + 1503297^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21001000021983 and 21001000022001.

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, 12963579451 + ... + 12963581070.

Almost surely, 2^{21001000022010} is an apocalyptic number.

21001000022010 is an abundant number, since it is smaller than the sum of its proper divisors (35468355594906).

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

21001000022010 is a wasteful number, since it uses less digits than its factorization.

21001000022010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25927160540 (or 25927160531 counting only the distinct ones).

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

Adding to 21001000022010 its reverse (1022000010012), we get a palindrome (22023000032022).

The spelling of 21001000022010 in words is "twenty-one trillion, one billion, twenty-two thousand, ten".