12679770021 has 16 divisors (see below), whose sum is σ = 17492448960. Its totient is φ = 8160239360.

The previous prime is 12679769959. The next prime is 12679770031. The reversal of 12679770021 is 12007797621.

It is a cyclic number.

It is not a de Polignac number, because 12679770021 - 2¹⁷ = 12679638949 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12679770031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 708301 + ... + 725981.

It is an arithmetic number, because the mean of its divisors is an integer number (1093278060).

Almost surely, 2^12679770021 is an apocalyptic number.

It is an amenable number.

12679770021 is a deficient number, since it is larger than the sum of its proper divisors (4812678939).

12679770021 is a wasteful number, since it uses less digits than its factorization.

12679770021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25956.

The product of its (nonzero) digits is 74088, while the sum is 42.

The spelling of 12679770021 in words is "twelve billion, six hundred seventy-nine million, seven hundred seventy thousand, twenty-one".