7212257520705 has 20 divisors (see below), whose sum is σ = 12928639408212. Its totient is φ = 3846537344160.

The previous prime is 7212257520703. The next prime is 7212257520733. The reversal of 7212257520705 is 5070257522127.

It is a happy number.

7212257520705 is a `hidden beast` number, since 7 + 2 + 1 + 2 + 2 + 57 + 520 + 70 + 5 = 666.

7212257520705 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 4010763230721 + 3201494289984 = 2002689^2 + 1789272^2 .

It is not a de Polignac number, because 7212257520705 - 2¹ = 7212257520703 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (7212257520703) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8904021226 + ... + 8904022035.

Almost surely, 2^{7212257520705} is an apocalyptic number.

It is an amenable number.

7212257520705 is a deficient number, since it is larger than the sum of its proper divisors (5716381887507).

7212257520705 is a wasteful number, since it uses less digits than its factorization.

7212257520705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17808043278 (or 17808043269 counting only the distinct ones).

The product of its (nonzero) digits is 686000, while the sum is 45.

The spelling of 7212257520705 in words is "seven trillion, two hundred twelve billion, two hundred fifty-seven million, five hundred twenty thousand, seven hundred five".