221998051 has 8 divisors (see below), whose sum is σ = 243076608. Its totient is φ = 201069000.

The previous prime is 221998031. The next prime is 221998069. The reversal of 221998051 is 150899122.

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

It is not a de Polignac number, because 221998051 - 2¹⁵ = 221965283 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 221998051.

It is not an unprimeable number, because it can be changed into a prime (221998031) 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, 34255 + ... + 40216.

It is an arithmetic number, because the mean of its divisors is an integer number (30384576).

Almost surely, 2^221998051 is an apocalyptic number.

221998051 is a deficient number, since it is larger than the sum of its proper divisors (21078557).

221998051 is a wasteful number, since it uses less digits than its factorization.

221998051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74753.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 221998051 is about 14899.5990214502. The cubic root of 221998051 is about 605.5031226804.

The spelling of 221998051 in words is "two hundred twenty-one million, nine hundred ninety-eight thousand, fifty-one".