3221521257 has 8 divisors (see below), whose sum is σ = 4395253984. Its totient is φ = 2097734688.

The previous prime is 3221521253. The next prime is 3221521273. The reversal of 3221521257 is 7521251223.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3221521257 - 2² = 3221521253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3221521253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12486388 + ... + 12486645.

It is an arithmetic number, because the mean of its divisors is an integer number (549406748).

Almost surely, 2^3221521257 is an apocalyptic number.

It is an amenable number.

3221521257 is a deficient number, since it is larger than the sum of its proper divisors (1173732727).

3221521257 is a wasteful number, since it uses less digits than its factorization.

3221521257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24973079.

The product of its digits is 8400, while the sum is 30.

The square root of 3221521257 is about 56758.4465696516. The cubic root of 3221521257 is about 1476.9087623277.

The spelling of 3221521257 in words is "three billion, two hundred twenty-one million, five hundred twenty-one thousand, two hundred fifty-seven".