15212214738 has 54 divisors (see below), whose sum is σ = 38350224549. Its totient is φ = 4345300512.

The previous prime is 15212214733. The next prime is 15212214751. The reversal of 15212214738 is 83741221251.

15212214738 is a `hidden beast` number, since 152 + 12 + 21 + 473 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9262715049 + 5949499689 = 96243^2 + 77133^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=87213.

It is a super-2 number, since 2×15212214738² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15212214733) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3660870 + ... + 3665022.

Almost surely, 2^15212214738 is an apocalyptic number.

15212214738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

15212214738 is an abundant number, since it is smaller than the sum of its proper divisors (23138009811).

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

15212214738 is an frugal number, since it uses more digits than its factorization.

15212214738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8328 (or 4165 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

Adding to 15212214738 its reverse (83741221251), we get a palindrome (98953435989).

The spelling of 15212214738 in words is "fifteen billion, two hundred twelve million, two hundred fourteen thousand, seven hundred thirty-eight".