21120204232 has 8 divisors (see below), whose sum is σ = 39600382950. Its totient is φ = 10560102112.

The previous prime is 21120204211. The next prime is 21120204239. The reversal of 21120204232 is 23240202112.

It can be written as a sum of positive squares in only one way, i.e., 20496503556 + 623700676 = 143166^2 + 24974^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21120204239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320012757 + ... + 1320012772.

Almost surely, 2^21120204232 is an apocalyptic number.

It is an amenable number.

21120204232 is a deficient number, since it is larger than the sum of its proper divisors (18480178718).

21120204232 is a wasteful number, since it uses less digits than its factorization.

21120204232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640025535 (or 2640025531 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21120204232 its reverse (23240202112), we get a palindrome (44360406344).

The spelling of 21120204232 in words is "twenty-one billion, one hundred twenty million, two hundred four thousand, two hundred thirty-two".