21001220022 has 16 divisors (see below), whose sum is σ = 42010532352. Its totient is φ = 6999057960.

The previous prime is 21001220003. The next prime is 21001220033. The reversal of 21001220022 is 22002210012.

It is a congruent number.

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, 303178 + ... + 365949.

It is an arithmetic number, because the mean of its divisors is an integer number (2625658272).

Almost surely, 2^21001220022 is an apocalyptic number.

21001220022 is an abundant number, since it is smaller than the sum of its proper divisors (21009312330).

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

21001220022 is a wasteful number, since it uses less digits than its factorization.

21001220022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674363.

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

Adding to 21001220022 its reverse (22002210012), we get a palindrome (43003430034).

The spelling of 21001220022 in words is "twenty-one billion, one million, two hundred twenty thousand, twenty-two".