12221572522 has 4 divisors (see below), whose sum is σ = 18332358786. Its totient is φ = 6110786260.

The previous prime is 12221572501. The next prime is 12221572529. The reversal of 12221572522 is 22527512221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12093180961 + 128391561 = 109969^2 + 11331^2 .

It is not an unprimeable number, because it can be changed into a prime (12221572529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3055393129 + ... + 3055393132.

Almost surely, 2^12221572522 is an apocalyptic number.

12221572522 is a deficient number, since it is larger than the sum of its proper divisors (6110786264).

12221572522 is an equidigital number, since it uses as much as digits as its factorization.

12221572522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6110786263.

The product of its digits is 11200, while the sum is 31.

The spelling of 12221572522 in words is "twelve billion, two hundred twenty-one million, five hundred seventy-two thousand, five hundred twenty-two".