221282879 has 4 divisors (see below), whose sum is σ = 221433576. Its totient is φ = 221132184.

The previous prime is 221282861. The next prime is 221282881. The reversal of 221282879 is 978282122.

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 221282879 - 2¹⁶ = 221217343 is a prime.

It is a super-2 number, since 2×221282879² = 97932225077057282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221282179) 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 3 ways as a sum of consecutive naturals, for example, 73124 + ... + 76089.

It is an arithmetic number, because the mean of its divisors is an integer number (55358394).

Almost surely, 2^221282879 is an apocalyptic number.

221282879 is a deficient number, since it is larger than the sum of its proper divisors (150697).

221282879 is a wasteful number, since it uses less digits than its factorization.

221282879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150696.

The product of its digits is 64512, while the sum is 41.

The square root of 221282879 is about 14875.5799550807. The cubic root of 221282879 is about 604.8522089654.

The spelling of 221282879 in words is "two hundred twenty-one million, two hundred eighty-two thousand, eight hundred seventy-nine".