213933128 has 8 divisors (see below), whose sum is σ = 401124630. Its totient is φ = 106966560.

The previous prime is 213933113. The next prime is 213933133. The reversal of 213933128 is 821339312.

It can be written as a sum of positive squares in only one way, i.e., 177475684 + 36457444 = 13322^2 + 6038^2 .

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 = 213933094 and 213933103.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13370813 + ... + 13370828.

Almost surely, 2^213933128 is an apocalyptic number.

It is an amenable number.

213933128 is a deficient number, since it is larger than the sum of its proper divisors (187191502).

213933128 is a wasteful number, since it uses less digits than its factorization.

213933128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26741647 (or 26741643 counting only the distinct ones).

The product of its digits is 7776, while the sum is 32.

The square root of 213933128 is about 14626.4530218368. The cubic root of 213933128 is about 598.0800927760.

The spelling of 213933128 in words is "two hundred thirteen million, nine hundred thirty-three thousand, one hundred twenty-eight".