21255442324202 has 16 divisors (see below), whose sum is σ = 32365671791112. Its totient is φ = 10467975475200.

The previous prime is 21255442324159. The next prime is 21255442324211. The reversal of 21255442324202 is 20242324455212.

It can be written as a sum of positive squares in 4 ways, for example, as 15059529796921 + 6195912527281 = 3880661^2 + 2489159^2 .

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, 272564543 + ... + 272642514.

Almost surely, 2^{21255442324202} is an apocalyptic number.

21255442324202 is a deficient number, since it is larger than the sum of its proper divisors (11110229466910).

21255442324202 is a wasteful number, since it uses less digits than its factorization.

21255442324202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545207353.

The product of its (nonzero) digits is 307200, while the sum is 38.

Adding to 21255442324202 its reverse (20242324455212), we get a palindrome (41497766779414).

The spelling of 21255442324202 in words is "twenty-one trillion, two hundred fifty-five billion, four hundred forty-two million, three hundred twenty-four thousand, two hundred two".