21328204036 has 12 divisors (see below), whose sum is σ = 37326170700. Its totient is φ = 10663583840.

The previous prime is 21328204033. The next prime is 21328204043. The reversal of 21328204036 is 63040282312.

It can be written as a sum of positive squares in 2 ways, for example, as 18548805636 + 2779398400 = 136194^2 + 52720^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21328203989 and 21328204007.

It is not an unprimeable number, because it can be changed into a prime (21328204033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28111 + ... + 208438.

It is an arithmetic number, because the mean of its divisors is an integer number (3110514225).

Almost surely, 2^21328204036 is an apocalyptic number.

It is an amenable number.

21328204036 is a deficient number, since it is larger than the sum of its proper divisors (15997966664).

21328204036 is a wasteful number, since it uses less digits than its factorization.

21328204036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259094 (or 259092 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 21328204036 its reverse (63040282312), we get a palindrome (84368486348).

The spelling of 21328204036 in words is "twenty-one billion, three hundred twenty-eight million, two hundred four thousand, thirty-six".