213242031 has 32 divisors (see below), whose sum is σ = 328669440. Its totient is φ = 136533600.

The previous prime is 213242027. The next prime is 213242077. The reversal of 213242031 is 130242312.

213242031 is a `hidden beast` number, since 213 + 2 + 420 + 31 = 666.

It is not a de Polignac number, because 213242031 - 2² = 213242027 is a prime.

It is a super-2 number, since 2×213242031² = 90944327570009922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213241995 and 213242013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213242011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69316 + ... + 72326.

It is an arithmetic number, because the mean of its divisors is an integer number (10270920).

Almost surely, 2^213242031 is an apocalyptic number.

213242031 is a deficient number, since it is larger than the sum of its proper divisors (115427409).

213242031 is a wasteful number, since it uses less digits than its factorization.

213242031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3124 (or 3118 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 213242031 is about 14602.8090105979. The cubic root of 213242031 is about 597.4353784795.

Adding to 213242031 its reverse (130242312), we get a palindrome (343484343).

The spelling of 213242031 in words is "two hundred thirteen million, two hundred forty-two thousand, thirty-one".