221221012102 has 32 divisors (see below), whose sum is σ = 348727654080. Its totient is φ = 105048683520.

The previous prime is 221221012063. The next prime is 221221012169. The reversal of 221221012102 is 201210122122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6037774 + ... + 6074302.

It is an arithmetic number, because the mean of its divisors is an integer number (10897739190).

Almost surely, 2^221221012102 is an apocalyptic number.

221221012102 is a deficient number, since it is larger than the sum of its proper divisors (127506641978).

221221012102 is a wasteful number, since it uses less digits than its factorization.

221221012102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37488.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221221012102 its reverse (201210122122), we get a palindrome (422431134224).

The spelling of 221221012102 in words is "two hundred twenty-one billion, two hundred twenty-one million, twelve thousand, one hundred two".