222100210021 has 2 divisors, whose sum is σ = 222100210022. Its totient is φ = 222100210020.

The previous prime is 222100209973. The next prime is 222100210027. The reversal of 222100210021 is 120012001222.

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., 177589759396 + 44510450625 = 421414^2 + 210975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222100210021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222100209983 and 222100210010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222100210027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111050105010 + 111050105011.

It is an arithmetic number, because the mean of its divisors is an integer number (111050105011).

Almost surely, 2^222100210021 is an apocalyptic number.

It is an amenable number.

222100210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

222100210021 is an equidigital number, since it uses as much as digits as its factorization.

222100210021 is an evil number, because the sum of its binary digits is even.

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

Adding to 222100210021 its reverse (120012001222), we get a palindrome (342112211243).

The spelling of 222100210021 in words is "two hundred twenty-two billion, one hundred million, two hundred ten thousand, twenty-one".