221340956 has 24 divisors (see below), whose sum is σ = 418758480. Its totient is φ = 102010752.

The previous prime is 221340947. The next prime is 221340967. The reversal of 221340956 is 659043122.

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, 36545 + ... + 42168.

It is an arithmetic number, because the mean of its divisors is an integer number (17448270).

Almost surely, 2^221340956 is an apocalyptic number.

It is an amenable number.

221340956 is a deficient number, since it is larger than the sum of its proper divisors (197417524).

221340956 is a wasteful number, since it uses less digits than its factorization.

221340956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78773 (or 78771 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 221340956 is about 14877.5319189710. The cubic root of 221340956 is about 604.9051200162.

The spelling of 221340956 in words is "two hundred twenty-one million, three hundred forty thousand, nine hundred fifty-six".