221240242 has 16 divisors (see below), whose sum is σ = 351827712. Its totient is φ = 104157360.

The previous prime is 221240221. The next prime is 221240251. The reversal of 221240242 is 242042122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45928 + ... + 50515.

It is an arithmetic number, because the mean of its divisors is an integer number (21989232).

Almost surely, 2^221240242 is an apocalyptic number.

221240242 is a deficient number, since it is larger than the sum of its proper divisors (130587470).

221240242 is a wasteful number, since it uses less digits than its factorization.

221240242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96513.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 221240242 is about 14874.1467654451. The cubic root of 221240242 is about 604.8133586330.

Adding to 221240242 its reverse (242042122), we get a palindrome (463282364).

The spelling of 221240242 in words is "two hundred twenty-one million, two hundred forty thousand, two hundred forty-two".