21012002022 has 32 divisors (see below), whose sum is σ = 46194344064. Its totient is φ = 6318665600.

The previous prime is 21012002021. The next prime is 21012002041. The reversal of 21012002022 is 22020021012.

It is a junction number, because it is equal to n+sod(n) for n = 21012001989 and 21012002007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012002021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1206483 + ... + 1223774.

It is an arithmetic number, because the mean of its divisors is an integer number (1443573252).

Almost surely, 2^21012002022 is an apocalyptic number.

21012002022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21012002022 is an abundant number, since it is smaller than the sum of its proper divisors (25182342042).

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

21012002022 is a wasteful number, since it uses less digits than its factorization.

21012002022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2430404.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21012002022 its reverse (22020021012), we get a palindrome (43032023034).

The spelling of 21012002022 in words is "twenty-one billion, twelve million, two thousand, twenty-two".