221242917 has 8 divisors (see below), whose sum is σ = 337132096. Its totient is φ = 126424512.

The previous prime is 221242909. The next prime is 221242919. The reversal of 221242917 is 719242122.

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

It is not a de Polignac number, because 221242917 - 2³ = 221242909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221242919) 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, 5267668 + ... + 5267709.

It is an arithmetic number, because the mean of its divisors is an integer number (42141512).

Almost surely, 2^221242917 is an apocalyptic number.

It is an amenable number.

221242917 is a deficient number, since it is larger than the sum of its proper divisors (115889179).

221242917 is a wasteful number, since it uses less digits than its factorization.

221242917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10535387.

The product of its digits is 4032, while the sum is 30.

The square root of 221242917 is about 14874.2366862976. The cubic root of 221242917 is about 604.8157962083.

The spelling of 221242917 in words is "two hundred twenty-one million, two hundred forty-two thousand, nine hundred seventeen".