13515231213 has 32 divisors (see below), whose sum is σ = 22106004480. Its totient is φ = 8092347120.

The previous prime is 13515231209. The next prime is 13515231269. The reversal of 13515231213 is 31213251531.

13515231213 is a `hidden beast` number, since 1 + 3 + 515 + 23 + 121 + 3 = 666.

It is not a de Polignac number, because 13515231213 - 2² = 13515231209 is a prime.

It is a super-2 number, since 2×13515231213² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13515230213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 249481 + ... + 298782.

It is an arithmetic number, because the mean of its divisors is an integer number (690812640).

Almost surely, 2^13515231213 is an apocalyptic number.

It is an amenable number.

13515231213 is a deficient number, since it is larger than the sum of its proper divisors (8590773267).

13515231213 is a wasteful number, since it uses less digits than its factorization.

13515231213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548366 (or 548360 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

Adding to 13515231213 its reverse (31213251531), we get a palindrome (44728482744).

The spelling of 13515231213 in words is "thirteen billion, five hundred fifteen million, two hundred thirty-one thousand, two hundred thirteen".