213012031 has 4 divisors (see below), whose sum is σ = 213095152. Its totient is φ = 212928912.

The previous prime is 213012011. The next prime is 213012043. The reversal of 213012031 is 130210312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213012031 - 2²³ = 204623423 is a prime.

It is a super-2 number, since 2×213012031² = 90748250701489922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213012001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37590 + ... + 42883.

It is an arithmetic number, because the mean of its divisors is an integer number (53273788).

Almost surely, 2^213012031 is an apocalyptic number.

213012031 is a deficient number, since it is larger than the sum of its proper divisors (83121).

213012031 is an equidigital number, since it uses as much as digits as its factorization.

213012031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83120.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 213012031 is about 14594.9316887747. The cubic root of 213012031 is about 597.2205059409.

Adding to 213012031 its reverse (130210312), we get a palindrome (343222343).

It can be divided in two parts, 21301 and 2031, that added together give a palindrome (23332).

The spelling of 213012031 in words is "two hundred thirteen million, twelve thousand, thirty-one".