12902025779721 has 81 divisors (see below), whose sum is σ = 20859082251111. Its totient is φ = 7681002357600.

The previous prime is 12902025779719. The next prime is 12902025779729. The reversal of 12902025779721 is 12797752020921.

The square root of 12902025779721 is 3591939.

It is a perfect power (a square), and thus also a powerful number.

12902025779721 is a `hidden beast` number, since 1 + 29 + 0 + 20 + 2 + 577 + 9 + 7 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1908583695225 + 10993442084496 = 1381515^2 + 3315636^2 .

It is not a de Polignac number, because 12902025779721 - 2¹ = 12902025779719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12902025779729) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 4342652766 + ... + 4342655736.

Almost surely, 2^{12902025779721} is an apocalyptic number.

12902025779721 is the 3591939-th square number.

12902025779721 is the 1795970-th centered octagonal number.

It is an amenable number.

12902025779721 is a deficient number, since it is larger than the sum of its proper divisors (7957056471390).

12902025779721 is an frugal number, since it uses more digits than its factorization.

12902025779721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6036 (or 3018 counting only the distinct ones).

The product of its (nonzero) digits is 2222640, while the sum is 54.

The spelling of 12902025779721 in words is "twelve trillion, nine hundred two billion, twenty-five million, seven hundred seventy-nine thousand, seven hundred twenty-one".