15215891223 has 16 divisors (see below), whose sum is σ = 21918280160. Its totient is φ = 9333702144.

The previous prime is 15215891221. The next prime is 15215891227. The reversal of 15215891223 is 32219851251.

It is a happy number.

It is not a de Polignac number, because 15215891223 - 2¹ = 15215891221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15215891221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 611038 + ... + 635451.

It is an arithmetic number, because the mean of its divisors is an integer number (1369892510).

Almost surely, 2^15215891223 is an apocalyptic number.

15215891223 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

15215891223 is a deficient number, since it is larger than the sum of its proper divisors (6702388937).

15215891223 is a wasteful number, since it uses less digits than its factorization.

15215891223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246818.

The product of its digits is 43200, while the sum is 39.

The spelling of 15215891223 in words is "fifteen billion, two hundred fifteen million, eight hundred ninety-one thousand, two hundred twenty-three".