221427969 has 32 divisors (see below), whose sum is σ = 353341440. Its totient is φ = 120597312.

The previous prime is 221427967. The next prime is 221427971. The reversal of 221427969 is 969724122.

It is an interprime number because it is at equal distance from previous prime (221427967) and next prime (221427971).

It is not a de Polignac number, because 221427969 - 2¹ = 221427967 is a prime.

It is a super-2 number, since 2×221427969² = 98060690910929922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221427969.

It is not an unprimeable number, because it can be changed into a prime (221427961) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172759 + ... + 174035.

It is an arithmetic number, because the mean of its divisors is an integer number (11041920).

Almost surely, 2^221427969 is an apocalyptic number.

It is an amenable number.

221427969 is a deficient number, since it is larger than the sum of its proper divisors (131913471).

221427969 is a wasteful number, since it uses less digits than its factorization.

221427969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669.

The product of its digits is 108864, while the sum is 42.

The square root of 221427969 is about 14880.4559405954. The cubic root of 221427969 is about 604.9843758914.

The spelling of 221427969 in words is "two hundred twenty-one million, four hundred twenty-seven thousand, nine hundred sixty-nine".