21232123202 has 16 divisors (see below), whose sum is σ = 31900635000. Its totient is φ = 10598595072.

The previous prime is 21232123163. The next prime is 21232123207. The reversal of 21232123202 is 20232123212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17355691081 + 3876432121 = 131741^2 + 62261^2 .

It is not an unprimeable number, because it can be changed into a prime (21232123207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3726668 + ... + 3732360.

Almost surely, 2^21232123202 is an apocalyptic number.

21232123202 is a deficient number, since it is larger than the sum of its proper divisors (10668511798).

21232123202 is a wasteful number, since it uses less digits than its factorization.

21232123202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8437.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21232123202 its reverse (20232123212), we get a palindrome (41464246414).

The spelling of 21232123202 in words is "twenty-one billion, two hundred thirty-two million, one hundred twenty-three thousand, two hundred two".