245454021 has 12 divisors (see below), whose sum is σ = 354688620. Its totient is φ = 163569600.

The previous prime is 245454017. The next prime is 245454023. The reversal of 245454021 is 120454542.

It can be written as a sum of positive squares in 2 ways, for example, as 171321921 + 74132100 = 13089^2 + 8610^2 .

It is not a de Polignac number, because 245454021 - 2² = 245454017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245454023) 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 11 ways as a sum of consecutive naturals, for example, 29625 + ... + 36993.

It is an arithmetic number, because the mean of its divisors is an integer number (29557385).

Almost surely, 2^245454021 is an apocalyptic number.

It is an amenable number.

245454021 is a deficient number, since it is larger than the sum of its proper divisors (109234599).

245454021 is a wasteful number, since it uses less digits than its factorization.

245454021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11076 (or 11073 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 245454021 is about 15666.9722984372. The cubic root of 245454021 is about 626.1187607906.

The spelling of 245454021 in words is "two hundred forty-five million, four hundred fifty-four thousand, twenty-one".