221271369 has 24 divisors (see below), whose sum is σ = 325328640. Its totient is φ = 133673760.

The previous prime is 221271353. The next prime is 221271373. The reversal of 221271369 is 963172122.

It is not a de Polignac number, because 221271369 - 2⁴ = 221271353 is a prime.

It is a super-2 number, since 2×221271369² = 97922037478268322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (221271469) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 140424 + ... + 141990.

It is an arithmetic number, because the mean of its divisors is an integer number (13555360).

Almost surely, 2^221271369 is an apocalyptic number.

It is an amenable number.

221271369 is a deficient number, since it is larger than the sum of its proper divisors (104057271).

221271369 is a wasteful number, since it uses less digits than its factorization.

221271369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981 (or 1970 counting only the distinct ones).

The product of its digits is 9072, while the sum is 33.

The square root of 221271369 is about 14875.1930743772. The cubic root of 221271369 is about 604.8417216807.

The spelling of 221271369 in words is "two hundred twenty-one million, two hundred seventy-one thousand, three hundred sixty-nine".