21002000000022 has 72 divisors (see below), whose sum is σ = 45639338024280. Its totient is φ = 6979944960000.

The previous prime is 21001999999943. The next prime is 21002000000029. The reversal of 21002000000022 is 22000000020012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21001999999950 and 21002000000013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002000000029) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9330074397 + ... + 9330076647.

Almost surely, 2^{21002000000022} is an apocalyptic number.

21002000000022 is an abundant number, since it is smaller than the sum of its proper divisors (24637338024258).

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

21002000000022 is an equidigital number, since it uses as much as digits as its factorization.

21002000000022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4670 (or 3846 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 21002000000022 its reverse (22000000020012), we get a palindrome (43002000020034).

The spelling of 21002000000022 in words is "twenty-one trillion, two billion, twenty-two", and thus it is an aban number and an uban number.