222379521 has 16 divisors (see below), whose sum is σ = 364930944. Its totient is φ = 117298944.

The previous prime is 222379519. The next prime is 222379537. The reversal of 222379521 is 125973222.

It is not a de Polignac number, because 222379521 - 2¹ = 222379519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (222379501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407016 + ... + 407561.

It is an arithmetic number, because the mean of its divisors is an integer number (22808184).

Almost surely, 2^222379521 is an apocalyptic number.

222379521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

222379521 is a deficient number, since it is larger than the sum of its proper divisors (142551423).

222379521 is a wasteful number, since it uses less digits than its factorization.

222379521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814600.

The product of its digits is 15120, while the sum is 33.

The square root of 222379521 is about 14912.3948780872. The cubic root of 222379521 is about 605.8497459942.

The spelling of 222379521 in words is "two hundred twenty-two million, three hundred seventy-nine thousand, five hundred twenty-one".