1221560056 has 16 divisors (see below), whose sum is σ = 2290911840. Its totient is φ = 610650240.

The previous prime is 1221560029. The next prime is 1221560063. The reversal of 1221560056 is 6500651221.

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, 32320 + ... + 59056.

It is an arithmetic number, because the mean of its divisors is an integer number (143181990).

Almost surely, 2^1221560056 is an apocalyptic number.

It is an amenable number.

1221560056 is a deficient number, since it is larger than the sum of its proper divisors (1069351784).

1221560056 is a wasteful number, since it uses less digits than its factorization.

1221560056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32454 (or 32450 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1221560056 is about 34950.8233951648. The cubic root of 1221560056 is about 1068.9849914017.

The spelling of 1221560056 in words is "one billion, two hundred twenty-one million, five hundred sixty thousand, fifty-six".