21432131432 has 8 divisors (see below), whose sum is σ = 40185246450. Its totient is φ = 10716065712.

The previous prime is 21432131381. The next prime is 21432131477. The reversal of 21432131432 is 23413123412.

It can be written as a sum of positive squares in only one way, i.e., 21197612836 + 234518596 = 145594^2 + 15314^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1339508207 + ... + 1339508222.

Almost surely, 2^21432131432 is an apocalyptic number.

It is an amenable number.

21432131432 is a deficient number, since it is larger than the sum of its proper divisors (18753115018).

21432131432 is a wasteful number, since it uses less digits than its factorization.

21432131432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2679016435 (or 2679016431 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

Adding to 21432131432 its reverse (23413123412), we get a palindrome (44845254844).

The spelling of 21432131432 in words is "twenty-one billion, four hundred thirty-two million, one hundred thirty-one thousand, four hundred thirty-two".