213121432 has 8 divisors (see below), whose sum is σ = 399602700. Its totient is φ = 106560712.

The previous prime is 213121421. The next prime is 213121451. The reversal of 213121432 is 234121312.

It is a happy number.

213121432 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13320082 + ... + 13320097.

Almost surely, 2^213121432 is an apocalyptic number.

It is an amenable number.

213121432 is a deficient number, since it is larger than the sum of its proper divisors (186481268).

213121432 is a wasteful number, since it uses less digits than its factorization.

213121432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26640185 (or 26640181 counting only the distinct ones).

The product of its digits is 288, while the sum is 19.

The square root of 213121432 is about 14598.6791183312. The cubic root of 213121432 is about 597.3227307434.

Adding to 213121432 its reverse (234121312), we get a palindrome (447242744).

The spelling of 213121432 in words is "two hundred thirteen million, one hundred twenty-one thousand, four hundred thirty-two".