22001200021 has 2 divisors, whose sum is σ = 22001200022. Its totient is φ = 22001200020.

The previous prime is 22001200019. The next prime is 22001200027. The reversal of 22001200021 is 12000210022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12168296100 + 9832903921 = 110310^2 + 99161^2 .

It is a cyclic number.

It is not a de Polignac number, because 22001200021 - 2¹ = 22001200019 is a prime.

Together with 22001200019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 22001199980 and 22001200007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22001200027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11000600010 + 11000600011.

It is an arithmetic number, because the mean of its divisors is an integer number (11000600011).

Almost surely, 2^22001200021 is an apocalyptic number.

It is an amenable number.

22001200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22001200021 is an equidigital number, since it uses as much as digits as its factorization.

22001200021 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 10.

Adding to 22001200021 its reverse (12000210022), we get a palindrome (34001410043).

The spelling of 22001200021 in words is "twenty-two billion, one million, two hundred thousand, twenty-one".