245966021 has 16 divisors (see below), whose sum is σ = 284697600. Its totient is φ = 208147968.

The previous prime is 245966009. The next prime is 245966027. The reversal of 245966021 is 120669542.

It is a happy number.

It is not a de Polignac number, because 245966021 - 2²⁶ = 178857157 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 (245966027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 365141 + ... + 365813.

It is an arithmetic number, because the mean of its divisors is an integer number (17793600).

Almost surely, 2^245966021 is an apocalyptic number.

It is an amenable number.

245966021 is a deficient number, since it is larger than the sum of its proper divisors (38731579).

245966021 is a wasteful number, since it uses less digits than its factorization.

245966021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 245966021 is about 15683.3038929940. The cubic root of 245966021 is about 626.5538051554.

The spelling of 245966021 in words is "two hundred forty-five million, nine hundred sixty-six thousand, twenty-one".