245420253215321 has 4 divisors (see below), whose sum is σ = 245436692392500. Its totient is φ = 245403814038144.

The previous prime is 245420253215251. The next prime is 245420253215323. The reversal of 245420253215321 is 123512352024542.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83778525669721 + 161641727545600 = 9153061^2 + 12713840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245420253215321 is a prime.

It is a super-2 number, since 2×245420253215321² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245420253215323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8219566196 + ... + 8219596053.

It is an arithmetic number, because the mean of its divisors is an integer number (61359173098125).

Almost surely, 2^{245420253215321} is an apocalyptic number.

It is an amenable number.

245420253215321 is a deficient number, since it is larger than the sum of its proper divisors (16439177179).

245420253215321 is a wasteful number, since it uses less digits than its factorization.

245420253215321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16439177178.

The product of its (nonzero) digits is 576000, while the sum is 41.

The spelling of 245420253215321 in words is "two hundred forty-five trillion, four hundred twenty billion, two hundred fifty-three million, two hundred fifteen thousand, three hundred twenty-one".