12762640021 has 8 divisors (see below), whose sum is σ = 12878495640. Its totient is φ = 12646835712.

The previous prime is 12762640019. The next prime is 12762640031. The reversal of 12762640021 is 12004626721.

It can be written as a sum of positive squares in 4 ways, for example, as 354907921 + 12407732100 = 18839^2 + 111390^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12762640021 - 2¹ = 12762640019 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 (12762640031) 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, 632931 + ... + 652783.

It is an arithmetic number, because the mean of its divisors is an integer number (1609811955).

Almost surely, 2^12762640021 is an apocalyptic number.

It is an amenable number.

12762640021 is a deficient number, since it is larger than the sum of its proper divisors (115855619).

12762640021 is a wasteful number, since it uses less digits than its factorization.

12762640021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25655.

The product of its (nonzero) digits is 8064, while the sum is 31.

The spelling of 12762640021 in words is "twelve billion, seven hundred sixty-two million, six hundred forty thousand, twenty-one".