221289492 has 12 divisors (see below), whose sum is σ = 516342176. Its totient is φ = 73763160.

The previous prime is 221289491. The next prime is 221289503. The reversal of 221289492 is 294982122.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 221289492.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221289491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9220384 + ... + 9220407.

Almost surely, 2^221289492 is an apocalyptic number.

It is an amenable number.

221289492 is an abundant number, since it is smaller than the sum of its proper divisors (295052684).

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

221289492 is a wasteful number, since it uses less digits than its factorization.

221289492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18440798 (or 18440796 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 221289492 is about 14875.8022304681. The cubic root of 221289492 is about 604.8582342061.

The spelling of 221289492 in words is "two hundred twenty-one million, two hundred eighty-nine thousand, four hundred ninety-two".