221221200010 has 32 divisors (see below), whose sum is σ = 408667925952. Its totient is φ = 86174081280.

The previous prime is 221221200001. The next prime is 221221200037. The reversal of 221221200010 is 10002122122.

It is a happy 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 15 ways as a sum of consecutive naturals, for example, 618396 + ... + 908215.

It is an arithmetic number, because the mean of its divisors is an integer number (12770872686).

Almost surely, 2^221221200010 is an apocalyptic number.

221221200010 is a deficient number, since it is larger than the sum of its proper divisors (187446725942).

221221200010 is a wasteful number, since it uses less digits than its factorization.

221221200010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526998.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221221200010 its reverse (10002122122), we get a palindrome (231223322132).

The spelling of 221221200010 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred thousand, ten".