215213221031 has 8 divisors (see below), whose sum is σ = 217900432800. Its totient is φ = 212531989120.

The previous prime is 215213221021. The next prime is 215213221033. The reversal of 215213221031 is 130122312512.

215213221031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 215213221031 - 2²² = 215209026727 is a prime.

It is a super-2 number, since 2×215213221031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215213220988 and 215213221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215213221033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1422515 + ... + 1566516.

It is an arithmetic number, because the mean of its divisors is an integer number (27237554100).

Almost surely, 2^215213221031 is an apocalyptic number.

215213221031 is a deficient number, since it is larger than the sum of its proper divisors (2687211769).

215213221031 is an equidigital number, since it uses as much as digits as its factorization.

215213221031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2989929.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 215213221031 its reverse (130122312512), we get a palindrome (345335533543).

The spelling of 215213221031 in words is "two hundred fifteen billion, two hundred thirteen million, two hundred twenty-one thousand, thirty-one".