222100010021 has 2 divisors, whose sum is σ = 222100010022. Its totient is φ = 222100010020.

The previous prime is 222100010003. The next prime is 222100010023. The reversal of 222100010021 is 120010001222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167208205921 + 54891804100 = 408911^2 + 234290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222100010021 is a prime.

Together with 222100010023, 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 = 222100009984 and 222100010011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222100010023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111050005010 + 111050005011.

It is an arithmetic number, because the mean of its divisors is an integer number (111050005011).

Almost surely, 2^222100010021 is an apocalyptic number.

It is an amenable number.

222100010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

222100010021 is an equidigital number, since it uses as much as digits as its factorization.

222100010021 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 11.

Adding to 222100010021 its reverse (120010001222), we get a palindrome (342110011243).

The spelling of 222100010021 in words is "two hundred twenty-two billion, one hundred million, ten thousand, twenty-one".