245252553021 has 24 divisors (see below), whose sum is σ = 404874335424. Its totient is φ = 140139823680.

The previous prime is 245252552953. The next prime is 245252553037. The reversal of 245252553021 is 120355252542.

245252553021 is a `hidden beast` number, since 2 + 4 + 52 + 52 + 5 + 530 + 21 = 666.

It is not a de Polignac number, because 245252553021 - 2⁷ = 245252552893 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245252553041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3878226 + ... + 3940956.

It is an arithmetic number, because the mean of its divisors is an integer number (16869763976).

Almost surely, 2^245252553021 is an apocalyptic number.

245252553021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

245252553021 is a deficient number, since it is larger than the sum of its proper divisors (159621782403).

245252553021 is a wasteful number, since it uses less digits than its factorization.

245252553021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124801 (or 124798 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 36.

The spelling of 245252553021 in words is "two hundred forty-five billion, two hundred fifty-two million, five hundred fifty-three thousand, twenty-one".