12779207919621 has 192 divisors, whose sum is σ = 22870129213440. Its totient is φ = 6987875132160.

The previous prime is 12779207919613. The next prime is 12779207919637. The reversal of 12779207919621 is 12691970297721.

12779207919621 is a `hidden beast` number, since 1 + 277 + 92 + 0 + 79 + 196 + 21 = 666.

It is not a de Polignac number, because 12779207919621 - 2³ = 12779207919613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12779207919661) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2035875135 + ... + 2035881411.

It is an arithmetic number, because the mean of its divisors is an integer number (119115256320).

Almost surely, 2^{12779207919621} is an apocalyptic number.

12779207919621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12779207919621 is a deficient number, since it is larger than the sum of its proper divisors (10090921293819).

12779207919621 is a wasteful number, since it uses less digits than its factorization.

12779207919621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7233 (or 7214 counting only the distinct ones).

The product of its (nonzero) digits is 12002256, while the sum is 63.

The spelling of 12779207919621 in words is "twelve trillion, seven hundred seventy-nine billion, two hundred seven million, nine hundred nineteen thousand, six hundred twenty-one".