213431432 has 8 divisors (see below), whose sum is σ = 400183950. Its totient is φ = 106715712.

The previous prime is 213431417. The next prime is 213431441. The reversal of 213431432 is 234134312.

It can be written as a sum of positive squares in only one way, i.e., 209844196 + 3587236 = 14486^2 + 1894^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 213431398 and 213431407.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13339457 + ... + 13339472.

Almost surely, 2^213431432 is an apocalyptic number.

It is an amenable number.

213431432 is a deficient number, since it is larger than the sum of its proper divisors (186752518).

213431432 is a wasteful number, since it uses less digits than its factorization.

213431432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26678935 (or 26678931 counting only the distinct ones).

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

The square root of 213431432 is about 14609.2926591262. The cubic root of 213431432 is about 597.6122063041.

Adding to 213431432 its reverse (234134312), we get a palindrome (447565744).

The spelling of 213431432 in words is "two hundred thirteen million, four hundred thirty-one thousand, four hundred thirty-two".