213212015 has 16 divisors (see below), whose sum is σ = 270109920. Its totient is φ = 161566272.

The previous prime is 213211993. The next prime is 213212029. The reversal of 213212015 is 510212312.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-213212015 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213211984 and 213212002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31187 + ... + 37403.

It is an arithmetic number, because the mean of its divisors is an integer number (16881870).

Almost surely, 2^213212015 is an apocalyptic number.

213212015 is a deficient number, since it is larger than the sum of its proper divisors (56897905).

213212015 is an frugal number, since it uses more digits than its factorization.

213212015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6279 (or 6241 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 213212015 is about 14601.7812269599. The cubic root of 213212015 is about 597.4073454479.

Adding to 213212015 its reverse (510212312), we get a palindrome (723424327).

It can be divided in two parts, 21321 and 2015, that multiplied together give a triangular number (42961815 = T₉₂₆₉).

The spelling of 213212015 in words is "two hundred thirteen million, two hundred twelve thousand, fifteen".