213311031 has 16 divisors (see below), whose sum is σ = 301529088. Its totient is φ = 133898400.

The previous prime is 213311029. The next prime is 213311041. The reversal of 213311031 is 130113312.

It is not a de Polignac number, because 213311031 - 2¹ = 213311029 is a prime.

It is a super-2 number, since 2×213311031² = 91003191892565922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 213311031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213311011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27555 + ... + 34436.

It is an arithmetic number, because the mean of its divisors is an integer number (18845568).

Almost surely, 2^213311031 is an apocalyptic number.

213311031 is a deficient number, since it is larger than the sum of its proper divisors (88218057).

213311031 is a wasteful number, since it uses less digits than its factorization.

213311031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62062.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 213311031 is about 14605.1713786590. The cubic root of 213311031 is about 597.4998101106.

Adding to 213311031 its reverse (130113312), we get a palindrome (343424343).

The spelling of 213311031 in words is "two hundred thirteen million, three hundred eleven thousand, thirty-one".