221902 has 4 divisors (see below), whose sum is σ = 332856. Its totient is φ = 110950.

The previous prime is 221891. The next prime is 221909. The reversal of 221902 is 209122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 209122 = 2 ⋅104561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221909) by changing a digit.

221902 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55474 + ... + 55477.

It is an arithmetic number, because the mean of its divisors is an integer number (83214).

2²²¹⁹⁰² is an apocalyptic number.

221902 is a deficient number, since it is larger than the sum of its proper divisors (110954).

221902 is a wasteful number, since it uses less digits than its factorization.

221902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110953.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 221902 is about 471.0647513877. The cubic root of 221902 is about 60.5415783219.

It can be divided in two parts, 2 and 21902, that added together give a square (21904 = 148²).

The spelling of 221902 in words is "two hundred twenty-one thousand, nine hundred two".