221241045 has 16 divisors (see below), whose sum is σ = 354264192. Its totient is φ = 117902400.

The previous prime is 221241037. The next prime is 221241067. The reversal of 221241045 is 540142122.

It is not a de Polignac number, because 221241045 - 2³ = 221241037 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16720 + ... + 26870.

It is an arithmetic number, because the mean of its divisors is an integer number (22141512).

Almost surely, 2^221241045 is an apocalyptic number.

It is an amenable number.

221241045 is a deficient number, since it is larger than the sum of its proper divisors (133023147).

221241045 is a wasteful number, since it uses less digits than its factorization.

221241045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11612.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 221241045 is about 14874.1737585655. The cubic root of 221241045 is about 604.8140903633.

Adding to 221241045 its reverse (540142122), we get a palindrome (761383167).

The spelling of 221241045 in words is "two hundred twenty-one million, two hundred forty-one thousand, forty-five".