21232131204 has 24 divisors (see below), whose sum is σ = 49595573440. Its totient is φ = 7069672224.

The previous prime is 21232131203. The next prime is 21232131209. The reversal of 21232131204 is 40213123212.

It is not an unprimeable number, because it can be changed into a prime (21232131203) 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, 951619 + ... + 973674.

Almost surely, 2^21232131204 is an apocalyptic number.

It is an amenable number.

21232131204 is an abundant number, since it is smaller than the sum of its proper divisors (28363442236).

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

21232131204 is a wasteful number, since it uses less digits than its factorization.

21232131204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1926219 (or 1926217 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21232131204 its reverse (40213123212), we get a palindrome (61445254416).

The spelling of 21232131204 in words is "twenty-one billion, two hundred thirty-two million, one hundred thirty-one thousand, two hundred four".