12345761621 has 8 divisors (see below), whose sum is σ = 12810150360. Its totient is φ = 11888252928.

The previous prime is 12345761611. The next prime is 12345761639. The reversal of 12345761621 is 12616754321.

It can be written as a sum of positive squares in 4 ways, for example, as 7108344721 + 5237416900 = 84311^2 + 72370^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12345761621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12345761611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1716356 + ... + 1723533.

It is an arithmetic number, because the mean of its divisors is an integer number (1601268795).

Almost surely, 2^12345761621 is an apocalyptic number.

It is an amenable number.

12345761621 is a deficient number, since it is larger than the sum of its proper divisors (464388739).

12345761621 is an equidigital number, since it uses as much as digits as its factorization.

12345761621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3440023.

The product of its digits is 60480, while the sum is 38.

The spelling of 12345761621 in words is "twelve billion, three hundred forty-five million, seven hundred sixty-one thousand, six hundred twenty-one".