1321656216 has 16 divisors (see below), whose sum is σ = 3304140600. Its totient is φ = 440552064.

The previous prime is 1321656209. The next prime is 1321656223. The reversal of 1321656216 is 6126561231.

It is an interprime number because it is at equal distance from previous prime (1321656209) and next prime (1321656223).

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, 27534481 + ... + 27534528.

Almost surely, 2^1321656216 is an apocalyptic number.

It is an amenable number.

1321656216 is an abundant number, since it is smaller than the sum of its proper divisors (1982484384).

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

1321656216 is a wasteful number, since it uses less digits than its factorization.

1321656216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55069018 (or 55069014 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 1321656216 is about 36354.5900265702. The cubic root of 1321656216 is about 1097.4199078474.

The spelling of 1321656216 in words is "one billion, three hundred twenty-one million, six hundred fifty-six thousand, two hundred sixteen".