102221111021 has 2 divisors, whose sum is σ = 102221111022. Its totient is φ = 102221111020.

The previous prime is 102221111017. The next prime is 102221111023. The reversal of 102221111021 is 120111122201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100977772900 + 1243338121 = 317770^2 + 35261^2 .

It is a cyclic number.

It is not a de Polignac number, because 102221111021 - 2² = 102221111017 is a prime.

Together with 102221111023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 102221110987 and 102221111005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102221111023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51110555510 + 51110555511.

It is an arithmetic number, because the mean of its divisors is an integer number (51110555511).

Almost surely, 2^102221111021 is an apocalyptic number.

It is an amenable number.

102221111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102221111021 is an equidigital number, since it uses as much as digits as its factorization.

102221111021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 102221111021 its reverse (120111122201), we get a palindrome (222332233222).

The spelling of 102221111021 in words is "one hundred two billion, two hundred twenty-one million, one hundred eleven thousand, twenty-one".