221151914 has 4 divisors (see below), whose sum is σ = 331727874. Its totient is φ = 110575956.

The previous prime is 221151913. The next prime is 221151937. The reversal of 221151914 is 419151122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 209815225 + 11336689 = 14485^2 + 3367^2 .

It is not an unprimeable number, because it can be changed into a prime (221151911) 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 as a sum of consecutive naturals, namely, 55287977 + ... + 55287980.

Almost surely, 2^221151914 is an apocalyptic number.

221151914 is a deficient number, since it is larger than the sum of its proper divisors (110575960).

221151914 is a wasteful number, since it uses less digits than its factorization.

221151914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110575959.

The product of its digits is 720, while the sum is 26.

The square root of 221151914 is about 14871.1772903157. The cubic root of 221151914 is about 604.7328593157.

The spelling of 221151914 in words is "two hundred twenty-one million, one hundred fifty-one thousand, nine hundred fourteen".