21020432324 has 12 divisors (see below), whose sum is σ = 36845381244. Its totient is φ = 10493180544.

The previous prime is 21020432273. The next prime is 21020432333. The reversal of 21020432324 is 42323402012.

It can be written as a sum of positive squares in 2 ways, for example, as 1527246400 + 19493185924 = 39080^2 + 139618^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21020432324.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4256129 + ... + 4261064.

It is an arithmetic number, because the mean of its divisors is an integer number (3070448437).

Almost surely, 2^21020432324 is an apocalyptic number.

It is an amenable number.

21020432324 is a deficient number, since it is larger than the sum of its proper divisors (15824948920).

21020432324 is a wasteful number, since it uses less digits than its factorization.

21020432324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8517814 (or 8517812 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21020432324 its reverse (42323402012), we get a palindrome (63343834336).

The spelling of 21020432324 in words is "twenty-one billion, twenty million, four hundred thirty-two thousand, three hundred twenty-four".