21142431324 has 96 divisors (see below), whose sum is σ = 64804454400. Its totient is φ = 5832388800.

The previous prime is 21142431313. The next prime is 21142431329. The reversal of 21142431324 is 42313424112.

21142431324 is a `hidden beast` number, since 211 + 424 + 3 + 1 + 3 + 24 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142431329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 460252 + ... + 504099.

It is an arithmetic number, because the mean of its divisors is an integer number (675046400).

Almost surely, 2^21142431324 is an apocalyptic number.

It is an amenable number.

21142431324 is an abundant number, since it is smaller than the sum of its proper divisors (43662023076).

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

21142431324 is a wasteful number, since it uses less digits than its factorization.

21142431324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964400 (or 964392 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21142431324 its reverse (42313424112), we get a palindrome (63455855436).

The spelling of 21142431324 in words is "twenty-one billion, one hundred forty-two million, four hundred thirty-one thousand, three hundred twenty-four".