221225120156 has 12 divisors (see below), whose sum is σ = 387172921800. Its totient is φ = 110604285360.

The previous prime is 221225120099. The next prime is 221225120167. The reversal of 221225120156 is 651021522122.

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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2008331 + ... + 2115618.

It is an arithmetic number, because the mean of its divisors is an integer number (32264410150).

Almost surely, 2^221225120156 is an apocalyptic number.

It is an amenable number.

221225120156 is a deficient number, since it is larger than the sum of its proper divisors (165947801644).

221225120156 is a wasteful number, since it uses less digits than its factorization.

221225120156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4137364 (or 4137362 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 221225120156 its reverse (651021522122), we get a palindrome (872246642278).

The spelling of 221225120156 in words is "two hundred twenty-one billion, two hundred twenty-five million, one hundred twenty thousand, one hundred fifty-six".