21022120210 has 64 divisors (see below), whose sum is σ = 48074471424. Its totient is φ = 6438528000.

The previous prime is 21022120183. The next prime is 21022120211. The reversal of 21022120210 is 1202122012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (21022120211) 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, 344391 + ... + 400810.

It is an arithmetic number, because the mean of its divisors is an integer number (751163616).

Almost surely, 2^21022120210 is an apocalyptic number.

21022120210 is an abundant number, since it is smaller than the sum of its proper divisors (27052351214).

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

21022120210 is a wasteful number, since it uses less digits than its factorization.

21022120210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745259.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21022120210 its reverse (1202122012), we get a palindrome (22224242222).

The spelling of 21022120210 in words is "twenty-one billion, twenty-two million, one hundred twenty thousand, two hundred ten".