21142431432 has 80 divisors (see below), whose sum is σ = 59241607260. Its totient is φ = 7044713856.

The previous prime is 21142431421. The next prime is 21142431433. The reversal of 21142431432 is 23413424112.

It can be written as a sum of positive squares in 2 ways, for example, as 16903640196 + 4238791236 = 130014^2 + 65106^2 .

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 junction number, because it is equal to n+sod(n) for n = 21142431396 and 21142431405.

It is not an unprimeable number, because it can be changed into a prime (21142431433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2274378 + ... + 2283654.

Almost surely, 2^21142431432 is an apocalyptic number.

It is an amenable number.

21142431432 is an abundant number, since it is smaller than the sum of its proper divisors (38099175828).

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

21142431432 is a wasteful number, since it uses less digits than its factorization.

21142431432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12812 (or 12799 counting only the distinct ones).

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

Adding to 21142431432 its reverse (23413424112), we get a palindrome (44555855544).

The spelling of 21142431432 in words is "twenty-one billion, one hundred forty-two million, four hundred thirty-one thousand, four hundred thirty-two".