321152240 has 20 divisors (see below), whose sum is σ = 746679144. Its totient is φ = 128460864.

The previous prime is 321152233. The next prime is 321152263. The reversal of 321152240 is 42251123.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×321152240² = 206277522514035200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2007122 + ... + 2007281.

Almost surely, 2^321152240 is an apocalyptic number.

It is an amenable number.

321152240 is an abundant number, since it is smaller than the sum of its proper divisors (425526904).

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

321152240 is a wasteful number, since it uses less digits than its factorization.

321152240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4014416 (or 4014410 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 321152240 is about 17920.7209676397. The cubic root of 321152240 is about 684.8103547325.

The spelling of 321152240 in words is "three hundred twenty-one million, one hundred fifty-two thousand, two hundred forty".