13212403155 has 32 divisors (see below), whose sum is σ = 26844249600. Its totient is φ = 6039955296.

The previous prime is 13212403147. The next prime is 13212403157. The reversal of 13212403155 is 55130421231.

13212403155 is a `hidden beast` number, since 1 + 321 + 24 + 0 + 315 + 5 = 666.

It is not a de Polignac number, because 13212403155 - 2³ = 13212403147 is a prime.

It is a super-3 number, since 3×13212403155³ (a number of 31 digits) contains 333 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (13212403157) 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, 6989745 + ... + 6991634.

It is an arithmetic number, because the mean of its divisors is an integer number (838882800).

Almost surely, 2^13212403155 is an apocalyptic number.

13212403155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13212403155 is an abundant number, since it is smaller than the sum of its proper divisors (13631846445).

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

13212403155 is a wasteful number, since it uses less digits than its factorization.

13212403155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13981400 (or 13981394 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 13212403155 its reverse (55130421231), we get a palindrome (68342824386).

The spelling of 13212403155 in words is "thirteen billion, two hundred twelve million, four hundred three thousand, one hundred fifty-five".