21022120102210 has 32 divisors (see below), whose sum is σ = 40065968945520. Its totient is φ = 7914154371072.

The previous prime is 21022120102169. The next prime is 21022120102211. The reversal of 21022120102210 is 1220102122012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 13361342370489 + 7660777731721 = 3655317^2 + 2767811^2 .

It is not an unprimeable number, because it can be changed into a prime (21022120102211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30197536 + ... + 30885844.

Almost surely, 2^{21022120102210} is an apocalyptic number.

21022120102210 is a deficient number, since it is larger than the sum of its proper divisors (19043848843310).

21022120102210 is a wasteful number, since it uses less digits than its factorization.

21022120102210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867990.

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

Adding to 21022120102210 its reverse (1220102122012), we get a palindrome (22242222224222).

The spelling of 21022120102210 in words is "twenty-one trillion, twenty-two billion, one hundred twenty million, one hundred two thousand, two hundred ten".