3215321397 has 12 divisors (see below), whose sum is σ = 4646972460. Its totient is φ = 2142338688.

The previous prime is 3215321309. The next prime is 3215321413. The reversal of 3215321397 is 7931235123.

It is a happy number.

3215321397 is a `hidden beast` number, since 3 + 21 + 532 + 13 + 97 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2307745521 + 907575876 = 48039^2 + 30126^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3215321397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3215321597) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83748 + ... + 115949.

It is an arithmetic number, because the mean of its divisors is an integer number (387247705).

Almost surely, 2^3215321397 is an apocalyptic number.

It is an amenable number.

3215321397 is a deficient number, since it is larger than the sum of its proper divisors (1431651063).

3215321397 is a wasteful number, since it uses less digits than its factorization.

3215321397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201492 (or 201489 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 3215321397 is about 56703.8040787388. The cubic root of 3215321397 is about 1475.9607104464.

The spelling of 3215321397 in words is "three billion, two hundred fifteen million, three hundred twenty-one thousand, three hundred ninety-seven".