221540502 has 16 divisors (see below), whose sum is σ = 445905072. Its totient is φ = 73376160.

The previous prime is 221540479. The next prime is 221540533. The reversal of 221540502 is 205045122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116649 + ... + 118532.

It is an arithmetic number, because the mean of its divisors is an integer number (27869067).

Almost surely, 2^221540502 is an apocalyptic number.

221540502 is an abundant number, since it is smaller than the sum of its proper divisors (224364570).

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

221540502 is a wasteful number, since it uses less digits than its factorization.

221540502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235343.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 221540502 is about 14884.2366952424. The cubic root of 221540502 is about 605.0868458987.

Adding to 221540502 its reverse (205045122), we get a palindrome (426585624).

The spelling of 221540502 in words is "two hundred twenty-one million, five hundred forty thousand, five hundred two".