12221542539 has 48 divisors (see below), whose sum is σ = 19776350880. Its totient is φ = 7227601920.

The previous prime is 12221542519. The next prime is 12221542589. The reversal of 12221542539 is 93524512221.

12221542539 is a `hidden beast` number, since 1 + 2 + 221 + 5 + 425 + 3 + 9 = 666.

It is not a de Polignac number, because 12221542539 - 2⁵ = 12221542507 is a prime.

It is a super-2 number, since 2×12221542539² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12221542519) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 562009 + ... + 583349.

It is an arithmetic number, because the mean of its divisors is an integer number (412007310).

Almost surely, 2^12221542539 is an apocalyptic number.

12221542539 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

12221542539 is a deficient number, since it is larger than the sum of its proper divisors (7554808341).

12221542539 is a wasteful number, since it uses less digits than its factorization.

12221542539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21580 (or 21577 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The spelling of 12221542539 in words is "twelve billion, two hundred twenty-one million, five hundred forty-two thousand, five hundred thirty-nine".