213356731 has 12 divisors (see below), whose sum is σ = 249722472. Its totient is φ = 181748448.

The previous prime is 213356707. The next prime is 213356753. The reversal of 213356731 is 137653312.

It is not a de Polignac number, because 213356731 - 2⁷ = 213356603 is a prime.

It is a super-2 number, since 2×213356731² = 91042189326012722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213356693 and 213356702.

It is not an unprimeable number, because it can be changed into a prime (213356701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5370 + ... + 21343.

It is an arithmetic number, because the mean of its divisors is an integer number (20810206).

Almost surely, 2^213356731 is an apocalyptic number.

213356731 is a deficient number, since it is larger than the sum of its proper divisors (36365741).

213356731 is a wasteful number, since it uses less digits than its factorization.

213356731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26890 (or 26883 counting only the distinct ones).

The product of its digits is 11340, while the sum is 31.

The square root of 213356731 is about 14606.7358092080. The cubic root of 213356731 is about 597.5424767454.

The spelling of 213356731 in words is "two hundred thirteen million, three hundred fifty-six thousand, seven hundred thirty-one".