221316975 has 96 divisors (see below), whose sum is σ = 454970880. Its totient is φ = 104544000.

The previous prime is 221316973. The next prime is 221316983. The reversal of 221316975 is 579613122.

It is not a de Polignac number, because 221316975 - 2¹ = 221316973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221316973) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 304062 + ... + 304788.

It is an arithmetic number, because the mean of its divisors is an integer number (4739280).

Almost surely, 2^221316975 is an apocalyptic number.

221316975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

221316975 is an abundant number, since it is smaller than the sum of its proper divisors (233653905).

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

221316975 is a wasteful number, since it uses less digits than its factorization.

221316975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798 (or 787 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 221316975 is about 14876.7259502889. The cubic root of 221316975 is about 604.8832732482.

The spelling of 221316975 in words is "two hundred twenty-one million, three hundred sixteen thousand, nine hundred seventy-five".