21020122021210 has 16 divisors (see below), whose sum is σ = 40746698072136. Its totient is φ = 7761275823168.

The previous prime is 21020122021081. The next prime is 21020122021231. The reversal of 21020122021210 is 1212022102012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13261039348041 + 7759082673169 = 3641571^2 + 2785513^2 .

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, 80846623029 + ... + 80846623288.

Almost surely, 2^{21020122021210} is an apocalyptic number.

21020122021210 is a deficient number, since it is larger than the sum of its proper divisors (19726576050926).

21020122021210 is a wasteful number, since it uses less digits than its factorization.

21020122021210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161693246337.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21020122021210 its reverse (1212022102012), we get a palindrome (22232144123222).

The spelling of 21020122021210 in words is "twenty-one trillion, twenty billion, one hundred twenty-two million, twenty-one thousand, two hundred ten".