221395897 has 8 divisors (see below), whose sum is σ = 227287296. Its totient is φ = 215553792.

The previous prime is 221395871. The next prime is 221395903. The reversal of 221395897 is 798593122.

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

It is a cyclic number.

It is not a de Polignac number, because 221395897 - 2¹¹ = 221393849 is a prime.

It is a super-2 number, since 2×221395897² = 98032286416869218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221395997) 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, 3133 + ... + 21274.

It is an arithmetic number, because the mean of its divisors is an integer number (28410912).

Almost surely, 2^221395897 is an apocalyptic number.

It is an amenable number.

221395897 is a deficient number, since it is larger than the sum of its proper divisors (5891399).

221395897 is a wasteful number, since it uses less digits than its factorization.

221395897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24647.

The product of its digits is 272160, while the sum is 46.

The square root of 221395897 is about 14879.3782464188. The cubic root of 221395897 is about 604.9551654957.

The spelling of 221395897 in words is "two hundred twenty-one million, three hundred ninety-five thousand, eight hundred ninety-seven".