12572105621 has 4 divisors (see below), whose sum is σ = 12605811372. Its totient is φ = 12538399872.

The previous prime is 12572105587. The next prime is 12572105627. The reversal of 12572105621 is 12650127521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12650127521 = 211 ⋅59953211.

It can be written as a sum of positive squares in 2 ways, for example, as 8044296100 + 4527809521 = 89690^2 + 67289^2 .

It is a cyclic number.

It is not a de Polignac number, because 12572105621 - 2¹⁸ = 12571843477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12572105627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16852316 + ... + 16853061.

It is an arithmetic number, because the mean of its divisors is an integer number (3151452843).

Almost surely, 2^12572105621 is an apocalyptic number.

It is an amenable number.

12572105621 is a deficient number, since it is larger than the sum of its proper divisors (33705751).

12572105621 is an equidigital number, since it uses as much as digits as its factorization.

12572105621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33705750.

The product of its (nonzero) digits is 8400, while the sum is 32.

The spelling of 12572105621 in words is "twelve billion, five hundred seventy-two million, one hundred five thousand, six hundred twenty-one".