12621855373 has 4 divisors (see below), whose sum is σ = 12623749020. Its totient is φ = 12619961728.

The previous prime is 12621855361. The next prime is 12621855409. The reversal of 12621855373 is 37355812621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37355812621 = 41 ⋅911117381.

It can be written as a sum of positive squares in 2 ways, for example, as 9155236489 + 3466618884 = 95683^2 + 58878^2 .

It is a cyclic number.

It is not a de Polignac number, because 12621855373 - 2⁵ = 12621855341 is a prime.

It is a super-2 number, since 2×12621855373² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12621859373) 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, 936790 + ... + 950167.

It is an arithmetic number, because the mean of its divisors is an integer number (3155937255).

Almost surely, 2^12621855373 is an apocalyptic number.

It is an amenable number.

12621855373 is a deficient number, since it is larger than the sum of its proper divisors (1893647).

12621855373 is an equidigital number, since it uses as much as digits as its factorization.

12621855373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893646.

The product of its digits is 302400, while the sum is 43.

The spelling of 12621855373 in words is "twelve billion, six hundred twenty-one million, eight hundred fifty-five thousand, three hundred seventy-three".