253417221 has 16 divisors (see below), whose sum is σ = 382518720. Its totient is φ = 165756240.

The previous prime is 253417211. The next prime is 253417259. The reversal of 253417221 is 122714352.

253417221 is a `hidden beast` number, since 25 + 3 + 417 + 221 = 666.

It is not a de Polignac number, because 253417221 - 2⁷ = 253417093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253417201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87115 + ... + 89976.

It is an arithmetic number, because the mean of its divisors is an integer number (23907420).

Almost surely, 2^253417221 is an apocalyptic number.

It is an amenable number.

253417221 is a deficient number, since it is larger than the sum of its proper divisors (129101499).

253417221 is a wasteful number, since it uses less digits than its factorization.

253417221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177153 (or 177147 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 253417221 is about 15919.0835477423. The cubic root of 253417221 is about 632.8178312747.

The spelling of 253417221 in words is "two hundred fifty-three million, four hundred seventeen thousand, two hundred twenty-one".