21001000020222 has 64 divisors (see below), whose sum is σ = 46824431270400. Its totient is φ = 6240309073920.

The previous prime is 21001000020211. The next prime is 21001000020229. The reversal of 21001000020222 is 22202000010012.

It is a junction number, because it is equal to n+sod(n) for n = 21001000020198 and 21001000020207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001000020229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6941479 + ... + 9496637.

It is an arithmetic number, because the mean of its divisors is an integer number (731631738600).

Almost surely, 2^{21001000020222} is an apocalyptic number.

21001000020222 is an abundant number, since it is smaller than the sum of its proper divisors (25823431250178).

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

21001000020222 is a wasteful number, since it uses less digits than its factorization.

21001000020222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2559441.

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

Adding to 21001000020222 its reverse (22202000010012), we get a palindrome (43203000030234).

The spelling of 21001000020222 in words is "twenty-one trillion, one billion, twenty thousand, two hundred twenty-two".