221402253 has 16 divisors (see below), whose sum is σ = 301371840. Its totient is φ = 144528384.

The previous prime is 221402249. The next prime is 221402257. The reversal of 221402253 is 352204122.

It is an interprime number because it is at equal distance from previous prime (221402249) and next prime (221402257).

It is not a de Polignac number, because 221402253 - 2² = 221402249 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221402257) 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 15 ways as a sum of consecutive naturals, for example, 103725 + ... + 105837.

It is an arithmetic number, because the mean of its divisors is an integer number (18835740).

Almost surely, 2^221402253 is an apocalyptic number.

It is an amenable number.

221402253 is a deficient number, since it is larger than the sum of its proper divisors (79969587).

221402253 is a wasteful number, since it uses less digits than its factorization.

221402253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2828.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 221402253 is about 14879.5918290792. The cubic root of 221402253 is about 604.9609546097.

Adding to 221402253 its reverse (352204122), we get a palindrome (573606375).

The spelling of 221402253 in words is "two hundred twenty-one million, four hundred two thousand, two hundred fifty-three".