1221571374 has 8 divisors (see below), whose sum is σ = 2443142760. Its totient is φ = 407190456.

The previous prime is 1221571367. The next prime is 1221571381. The reversal of 1221571374 is 4731751221.

It is an interprime number because it is at equal distance from previous prime (1221571367) and next prime (1221571381).

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

1221571374 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101797609 + ... + 101797620.

It is an arithmetic number, because the mean of its divisors is an integer number (305392845).

Almost surely, 2^1221571374 is an apocalyptic number.

1221571374 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1221571374 is a wasteful number, since it uses less digits than its factorization.

1221571374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203595234.

The product of its digits is 11760, while the sum is 33.

The square root of 1221571374 is about 34950.9853079995. The cubic root of 1221571374 is about 1068.9882928453.

The spelling of 1221571374 in words is "one billion, two hundred twenty-one million, five hundred seventy-one thousand, three hundred seventy-four".