21430031324 has 24 divisors (see below), whose sum is σ = 40409603808. Its totient is φ = 9885337920.

The previous prime is 21430031267. The next prime is 21430031351. The reversal of 21430031324 is 42313003412.

It is a self number, because there is not a number n which added to its sum of digits gives 21430031324.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17327 + ... + 207750.

It is an arithmetic number, because the mean of its divisors is an integer number (1683733492).

Almost surely, 2^21430031324 is an apocalyptic number.

It is an amenable number.

21430031324 is a deficient number, since it is larger than the sum of its proper divisors (18979572484).

21430031324 is a wasteful number, since it uses less digits than its factorization.

21430031324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226925 (or 226923 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21430031324 its reverse (42313003412), we get a palindrome (63743034736).

The spelling of 21430031324 in words is "twenty-one billion, four hundred thirty million, thirty-one thousand, three hundred twenty-four".