213215031 has 16 divisors (see below), whose sum is σ = 316166400. Its totient is φ = 142011864.

The previous prime is 213215011. The next prime is 213215033. The reversal of 213215031 is 130512312.

It is a de Polignac number, because none of the positive numbers 2^k-213215031 is a prime.

It is a super-2 number, since 2×213215031² = 90921298888661922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213214995 and 213215013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213215033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32620 + ... + 38606.

It is an arithmetic number, because the mean of its divisors is an integer number (19760400).

Almost surely, 2^213215031 is an apocalyptic number.

213215031 is a deficient number, since it is larger than the sum of its proper divisors (102951369).

213215031 is a wasteful number, since it uses less digits than its factorization.

213215031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7315 (or 7309 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 213215031 is about 14601.8845016662. The cubic root of 213215031 is about 597.4101623186.

Adding to 213215031 its reverse (130512312), we get a palindrome (343727343).

The spelling of 213215031 in words is "two hundred thirteen million, two hundred fifteen thousand, thirty-one".