221657099 has 8 divisors (see below), whose sum is σ = 229764480. Its totient is φ = 213609600.

The previous prime is 221657087. The next prime is 221657113. The reversal of 221657099 is 990756122.

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 221657099 - 2¹⁶ = 221591563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221657039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7364 + ... + 22305.

It is an arithmetic number, because the mean of its divisors is an integer number (28720560).

Almost surely, 2^221657099 is an apocalyptic number.

221657099 is a deficient number, since it is larger than the sum of its proper divisors (8107381).

221657099 is a wasteful number, since it uses less digits than its factorization.

221657099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29941.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 221657099 is about 14888.1529747649. The cubic root of 221657099 is about 605.1929798966.

The spelling of 221657099 in words is "two hundred twenty-one million, six hundred fifty-seven thousand, ninety-nine".