102221021221 has 16 divisors (see below), whose sum is σ = 116965238400. Its totient is φ = 88427243520.

The previous prime is 102221021173. The next prime is 102221021239. The reversal of 102221021221 is 122120122201.

It is a happy number.

It is not a de Polignac number, because 102221021221 - 2⁷ = 102221021093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102221021195 and 102221021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102221021521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 997896 + ... + 1095553.

It is an arithmetic number, because the mean of its divisors is an integer number (7310327400).

Almost surely, 2^102221021221 is an apocalyptic number.

102221021221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

102221021221 is a deficient number, since it is larger than the sum of its proper divisors (14744217179).

102221021221 is a wasteful number, since it uses less digits than its factorization.

102221021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093676.

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

Adding to 102221021221 its reverse (122120122201), we get a palindrome (224341143422).

The spelling of 102221021221 in words is "one hundred two billion, two hundred twenty-one million, twenty-one thousand, two hundred twenty-one".