221492 has 6 divisors (see below), whose sum is σ = 387618. Its totient is φ = 110744.

The previous prime is 221489. The next prime is 221497. The reversal of 221492 is 294122.

221492 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 206116 + 15376 = 454^2 + 124^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27683 + ... + 27690.

It is an arithmetic number, because the mean of its divisors is an integer number (64603).

2²²¹⁴⁹² is an apocalyptic number.

It is an amenable number.

221492 is a deficient number, since it is larger than the sum of its proper divisors (166126).

221492 is a wasteful number, since it uses less digits than its factorization.

221492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55377 (or 55375 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

The square root of 221492 is about 470.6293658496. The cubic root of 221492 is about 60.5042685329.

The spelling of 221492 in words is "two hundred twenty-one thousand, four hundred ninety-two".