221525494 has 8 divisors (see below), whose sum is σ = 333246888. Its totient is φ = 110443200.

The previous prime is 221525393. The next prime is 221525497. The reversal of 221525494 is 494525122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221525497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158907 + ... + 160294.

It is an arithmetic number, because the mean of its divisors is an integer number (41655861).

Almost surely, 2^221525494 is an apocalyptic number.

221525494 is a deficient number, since it is larger than the sum of its proper divisors (111721394).

221525494 is a wasteful number, since it uses less digits than its factorization.

221525494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319550.

The product of its digits is 28800, while the sum is 34.

The square root of 221525494 is about 14883.7325291743. The cubic root of 221525494 is about 605.0731819586.

The spelling of 221525494 in words is "two hundred twenty-one million, five hundred twenty-five thousand, four hundred ninety-four".