213520756 has 6 divisors (see below), whose sum is σ = 373661330. Its totient is φ = 106760376.

The previous prime is 213520733. The next prime is 213520781. The reversal of 213520756 is 657025312.

It can be written as a sum of positive squares in only one way, i.e., 158256400 + 55264356 = 12580^2 + 7434^2 .

It is a super-2 number, since 2×213520756² = 91182226485623072, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26690091 + ... + 26690098.

Almost surely, 2^213520756 is an apocalyptic number.

It is an amenable number.

213520756 is a deficient number, since it is larger than the sum of its proper divisors (160140574).

213520756 is a wasteful number, since it uses less digits than its factorization.

213520756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53380193 (or 53380191 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 213520756 is about 14612.3494346392. The cubic root of 213520756 is about 597.6955643285.

The spelling of 213520756 in words is "two hundred thirteen million, five hundred twenty thousand, seven hundred fifty-six".