249421220 has 24 divisors (see below), whose sum is σ = 525660408. Its totient is φ = 99411200.

The previous prime is 249421219. The next prime is 249421247. The reversal of 249421220 is 22124942.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 30558784 + 218862436 = 5528^2 + 14794^2 .

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 249421220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16571 + ... + 27810.

It is an arithmetic number, because the mean of its divisors is an integer number (21902517).

Almost surely, 2^249421220 is an apocalyptic number.

249421220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

249421220 is an abundant number, since it is smaller than the sum of its proper divisors (276239188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

249421220 is a wasteful number, since it uses less digits than its factorization.

249421220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44671 (or 44669 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 249421220 is about 15793.0750647238. The cubic root of 249421220 is about 629.4740045662.

It can be divided in two parts, 24942 and 1220, that added together give a palindrome (26162).

The spelling of 249421220 in words is "two hundred forty-nine million, four hundred twenty-one thousand, two hundred twenty".