221271397 has 8 divisors (see below), whose sum is σ = 240431360. Its totient is φ = 202862880.

The previous prime is 221271373. The next prime is 221271409. The reversal of 221271397 is 793172122.

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 221271397 - 2²⁷ = 87053669 is a prime.

It is a super-2 number, since 2×221271397² = 97922062260663218, 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 (221271497) 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 7 ways as a sum of consecutive naturals, for example, 187248 + ... + 188425.

It is an arithmetic number, because the mean of its divisors is an integer number (30053920).

Almost surely, 2^221271397 is an apocalyptic number.

It is an amenable number.

221271397 is a deficient number, since it is larger than the sum of its proper divisors (19159963).

221271397 is a wasteful number, since it uses less digits than its factorization.

221271397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375723.

The product of its digits is 10584, while the sum is 34.

The square root of 221271397 is about 14875.1940155414. The cubic root of 221271397 is about 604.8417471932.

The spelling of 221271397 in words is "two hundred twenty-one million, two hundred seventy-one thousand, three hundred ninety-seven".