215213131 has 8 divisors (see below), whose sum is σ = 246223584. Its totient is φ = 184269120.

The previous prime is 215213099. The next prime is 215213137. The reversal of 215213131 is 131312512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 215213131 - 2⁵ = 215213099 is a prime.

It is a super-2 number, since 2×215213131² = 92633383509646322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215213099 and 215213108.

It is not an unprimeable number, because it can be changed into a prime (215213137) 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, 9460 + ... + 22801.

It is an arithmetic number, because the mean of its divisors is an integer number (30777948).

Almost surely, 2^215213131 is an apocalyptic number.

215213131 is a deficient number, since it is larger than the sum of its proper divisors (31010453).

215213131 is an equidigital number, since it uses as much as digits as its factorization.

215213131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33221.

The product of its digits is 180, while the sum is 19.

The square root of 215213131 is about 14670.1442051535. The cubic root of 215213131 is about 599.2705310772.

Adding to 215213131 its reverse (131312512), we get a palindrome (346525643).

The spelling of 215213131 in words is "two hundred fifteen million, two hundred thirteen thousand, one hundred thirty-one".