215123321512 has 16 divisors (see below), whose sum is σ = 440024976000. Its totient is φ = 97783327920.

The previous prime is 215123321503. The next prime is 215123321513.

215123321512 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×215123321512² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215123321513) 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, 1222291512 + ... + 1222291687.

It is an arithmetic number, because the mean of its divisors is an integer number (27501561000).

Almost surely, 2^215123321512 is an apocalyptic number.

215123321512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

215123321512 is an abundant number, since it is smaller than the sum of its proper divisors (224901654488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215123321512 is a wasteful number, since it uses less digits than its factorization.

215123321512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2444583216 (or 2444583212 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

It can be divided in two parts, 215123 and 321512, that added together give a palindrome (536635).

The spelling of 215123321512 in words is "two hundred fifteen billion, one hundred twenty-three million, three hundred twenty-one thousand, five hundred twelve".