245329921 has 16 divisors (see below), whose sum is σ = 257292288. Its totient is φ = 233730000.

The previous prime is 245329913. The next prime is 245329949. The reversal of 245329921 is 129923542.

It is a cyclic number.

It is not a de Polignac number, because 245329921 - 2³ = 245329913 is a prime.

It is a Duffinian number.

Its product of digits (38880) is a multiple of the sum of its prime divisors (972).

It is not an unprimeable number, because it can be changed into a prime (245329901) 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, 326296 + ... + 327046.

It is an arithmetic number, because the mean of its divisors is an integer number (16080768).

Almost surely, 2^245329921 is an apocalyptic number.

It is an amenable number.

245329921 is a deficient number, since it is larger than the sum of its proper divisors (11962367).

245329921 is a wasteful number, since it uses less digits than its factorization.

245329921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972.

The product of its digits is 38880, while the sum is 37.

The square root of 245329921 is about 15663.0112366684. The cubic root of 245329921 is about 626.0132224408.

It can be divided in two parts, 24532 and 9921, that added together give a triangular number (34453 = T₂₆₂).

The spelling of 245329921 in words is "two hundred forty-five million, three hundred twenty-nine thousand, nine hundred twenty-one".