221052379 has 16 divisors (see below), whose sum is σ = 237042432. Its totient is φ = 205638048.

The previous prime is 221052341. The next prime is 221052397. The reversal of 221052379 is 973250122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221052379 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221052379.

It is not an unprimeable number, because it can be changed into a prime (221052329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 392352 + ... + 392914.

It is an arithmetic number, because the mean of its divisors is an integer number (14815152).

Almost surely, 2^221052379 is an apocalyptic number.

221052379 is a deficient number, since it is larger than the sum of its proper divisors (15990053).

221052379 is a wasteful number, since it uses less digits than its factorization.

221052379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 221052379 is about 14867.8303393602. The cubic root of 221052379 is about 604.6421206064.

The spelling of 221052379 in words is "two hundred twenty-one million, fifty-two thousand, three hundred seventy-nine".