249898338921 has 16 divisors (see below), whose sum is σ = 415415420928. Its totient is φ = 129817318800.

The previous prime is 249898338919. The next prime is 249898338931. The reversal of 249898338921 is 129833898942.

It is a happy number.

It is not a de Polignac number, because 249898338921 - 2¹ = 249898338919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (249898338931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 540905265 + ... + 540905726.

It is an arithmetic number, because the mean of its divisors is an integer number (25963463808).

Almost surely, 2^249898338921 is an apocalyptic number.

249898338921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

249898338921 is a deficient number, since it is larger than the sum of its proper divisors (165517082007).

249898338921 is a wasteful number, since it uses less digits than its factorization.

249898338921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081811012.

The product of its digits is 53747712, while the sum is 66.

The spelling of 249898338921 in words is "two hundred forty-nine billion, eight hundred ninety-eight million, three hundred thirty-eight thousand, nine hundred twenty-one".