21201020022 has 64 divisors (see below), whose sum is σ = 53252236800. Its totient is φ = 5591470752.

The previous prime is 21201020003. The next prime is 21201020023. The reversal of 21201020022 is 22002010212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201020023) 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, 369468 + ... + 422975.

It is an arithmetic number, because the mean of its divisors is an integer number (832066200).

Almost surely, 2^21201020022 is an apocalyptic number.

21201020022 is an abundant number, since it is smaller than the sum of its proper divisors (32051216778).

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

21201020022 is a wasteful number, since it uses less digits than its factorization.

21201020022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792482 (or 792468 counting only the distinct ones).

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

Adding to 21201020022 its reverse (22002010212), we get a palindrome (43203030234).

The spelling of 21201020022 in words is "twenty-one billion, two hundred one million, twenty thousand, twenty-two".