245402251452221 has 12 divisors (see below), whose sum is σ = 260945182623540. Its totient is φ = 230737917957120.

The previous prime is 245402251452181. The next prime is 245402251452227. The reversal of 245402251452221 is 122254152204542.

It can be written as a sum of positive squares in 6 ways, for example, as 21828882835321 + 223573368616900 = 4672139^2 + 14952370^2 .

It is not a de Polignac number, because 245402251452221 - 2³⁰ = 245401177710397 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 (245402251452227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 420492710 + ... + 421075911.

It is an arithmetic number, because the mean of its divisors is an integer number (21745431885295).

Almost surely, 2^{245402251452221} is an apocalyptic number.

It is an amenable number.

245402251452221 is a deficient number, since it is larger than the sum of its proper divisors (15542931171319).

245402251452221 is a wasteful number, since it uses less digits than its factorization.

245402251452221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841569664 (or 841569647 counting only the distinct ones).

The product of its (nonzero) digits is 512000, while the sum is 41.

The spelling of 245402251452221 in words is "two hundred forty-five trillion, four hundred two billion, two hundred fifty-one million, four hundred fifty-two thousand, two hundred twenty-one".