221315051 has 4 divisors (see below), whose sum is σ = 221524704. Its totient is φ = 221105400.

The previous prime is 221315041. The next prime is 221315053. The reversal of 221315051 is 150513122.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 221315051 - 2⁶ = 221314987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221315053) 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 3 ways as a sum of consecutive naturals, for example, 103235 + ... + 105356.

It is an arithmetic number, because the mean of its divisors is an integer number (55381176).

Almost surely, 2^221315051 is an apocalyptic number.

221315051 is a deficient number, since it is larger than the sum of its proper divisors (209653).

221315051 is a wasteful number, since it uses less digits than its factorization.

221315051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209652.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 221315051 is about 14876.6612853826. The cubic root of 221315051 is about 604.8815204096.

Adding to 221315051 its reverse (150513122), we get a palindrome (371828173).

The spelling of 221315051 in words is "two hundred twenty-one million, three hundred fifteen thousand, fifty-one".