1221571368 has 80 divisors (see below), whose sum is σ = 3531960960. Its totient is φ = 394048800.

The previous prime is 1221571367. The next prime is 1221571381. The reversal of 1221571368 is 8631751221.

1221571368 is a `hidden beast` number, since 1 + 2 + 21 + 571 + 3 + 68 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1221571367) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10318 + ... + 50493.

It is an arithmetic number, because the mean of its divisors is an integer number (44149512).

Almost surely, 2^1221571368 is an apocalyptic number.

1221571368 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1221571368 is an abundant number, since it is smaller than the sum of its proper divisors (2310389592).

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

1221571368 is a wasteful number, since it uses less digits than its factorization.

1221571368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60860 (or 60847 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 1221571368 is about 34950.9852221651. The cubic root of 1221571368 is about 1068.9882910951.

The spelling of 1221571368 in words is "one billion, two hundred twenty-one million, five hundred seventy-one thousand, three hundred sixty-eight".