213131004 has 24 divisors (see below), whose sum is σ = 500088960. Its totient is φ = 70646064.

The previous prime is 213131003. The next prime is 213131027. The reversal of 213131004 is 400131312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213131003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47464 + ... + 51759.

It is an arithmetic number, because the mean of its divisors is an integer number (20837040).

Almost surely, 2^213131004 is an apocalyptic number.

It is an amenable number.

213131004 is an abundant number, since it is smaller than the sum of its proper divisors (286957956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213131004 is a wasteful number, since it uses less digits than its factorization.

213131004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99409 (or 99407 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 213131004 is about 14599.0069525293. The cubic root of 213131004 is about 597.3316732001.

Adding to 213131004 its reverse (400131312), we get a palindrome (613262316).

The spelling of 213131004 in words is "two hundred thirteen million, one hundred thirty-one thousand, four".