221851079 has 8 divisors (see below), whose sum is σ = 224202000. Its totient is φ = 219506112.

The previous prime is 221851067. The next prime is 221851099. The reversal of 221851079 is 970158122.

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 221851079 - 2⁸ = 221850823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221851009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139712 + ... + 141290.

It is an arithmetic number, because the mean of its divisors is an integer number (28025250).

Almost surely, 2^221851079 is an apocalyptic number.

221851079 is a deficient number, since it is larger than the sum of its proper divisors (2350921).

221851079 is a wasteful number, since it uses less digits than its factorization.

221851079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2977.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 221851079 is about 14894.6661258318. Note that the first 3 decimals coincide. The cubic root of 221851079 is about 605.3694703794.

The spelling of 221851079 in words is "two hundred twenty-one million, eight hundred fifty-one thousand, seventy-nine".