1221895363 has 8 divisors (see below), whose sum is σ = 1351452368. Its totient is φ = 1097419104.

The previous prime is 1221895357. The next prime is 1221895391. The reversal of 1221895363 is 3635981221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221895363 - 2⁹ = 1221894851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221895313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1269681 + ... + 1270642.

It is an arithmetic number, because the mean of its divisors is an integer number (168931546).

Almost surely, 2^1221895363 is an apocalyptic number.

1221895363 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1221895363 is a deficient number, since it is larger than the sum of its proper divisors (129557005).

1221895363 is a wasteful number, since it uses less digits than its factorization.

1221895363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2540373.

The product of its digits is 77760, while the sum is 40.

The square root of 1221895363 is about 34955.6199058177. The cubic root of 1221895363 is about 1069.0827913032.

The spelling of 1221895363 in words is "one billion, two hundred twenty-one million, eight hundred ninety-five thousand, three hundred sixty-three".