221002254 has 24 divisors (see below), whose sum is σ = 522369432. Its totient is φ = 66970320.

The previous prime is 221002231. The next prime is 221002273. The reversal of 221002254 is 452200122.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 557889 + ... + 558284.

It is an arithmetic number, because the mean of its divisors is an integer number (21765393).

Almost surely, 2^221002254 is an apocalyptic number.

221002254 is an abundant number, since it is smaller than the sum of its proper divisors (301367178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221002254 is a wasteful number, since it uses less digits than its factorization.

221002254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116192 (or 1116189 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 221002254 is about 14866.1445573491. The cubic root of 221002254 is about 604.5964150327.

Adding to 221002254 its reverse (452200122), we get a palindrome (673202376).

The spelling of 221002254 in words is "two hundred twenty-one million, two thousand, two hundred fifty-four".