215330123131 has 4 divisors (see below), whose sum is σ = 215336981664. Its totient is φ = 215323264600.

The previous prime is 215330123123. The next prime is 215330123167. The reversal of 215330123131 is 131321033512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 215330123131 - 2³ = 215330123123 is a prime.

It is a super-2 number, since 2×215330123131² (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 = 215330123096 and 215330123105.

It is not an unprimeable number, because it can be changed into a prime (215330123231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3381955 + ... + 3445036.

It is an arithmetic number, because the mean of its divisors is an integer number (53834245416).

Almost surely, 2^215330123131 is an apocalyptic number.

215330123131 is a deficient number, since it is larger than the sum of its proper divisors (6858533).

215330123131 is an equidigital number, since it uses as much as digits as its factorization.

215330123131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6858532.

The product of its (nonzero) digits is 1620, while the sum is 25.

Adding to 215330123131 its reverse (131321033512), we get a palindrome (346651156643).

The spelling of 215330123131 in words is "two hundred fifteen billion, three hundred thirty million, one hundred twenty-three thousand, one hundred thirty-one".