221572542 has 32 divisors (see below), whose sum is σ = 452656512. Its totient is φ = 72279584.

The previous prime is 221572529. The next prime is 221572573. The reversal of 221572542 is 245275122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186073 + ... + 187259.

It is an arithmetic number, because the mean of its divisors is an integer number (14145516).

Almost surely, 2^221572542 is an apocalyptic number.

221572542 is an abundant number, since it is smaller than the sum of its proper divisors (231083970).

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

221572542 is a wasteful number, since it uses less digits than its factorization.

221572542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1832.

The product of its digits is 11200, while the sum is 30.

The square root of 221572542 is about 14885.3129627831. The cubic root of 221572542 is about 605.1160144523.

The spelling of 221572542 in words is "two hundred twenty-one million, five hundred seventy-two thousand, five hundred forty-two".