22001201021 has 2 divisors, whose sum is σ = 22001201022. Its totient is φ = 22001201020.

The previous prime is 22001201017. The next prime is 22001201023. The reversal of 22001201021 is 12010210022.

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., 18493008121 + 3508192900 = 135989^2 + 59230^2 .

It is a cyclic number.

It is not a de Polignac number, because 22001201021 - 2² = 22001201017 is a prime.

Together with 22001201023, 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 = 22001200993 and 22001201011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22001201023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11000600510 + 11000600511.

It is an arithmetic number, because the mean of its divisors is an integer number (11000600511).

Almost surely, 2^22001201021 is an apocalyptic number.

It is an amenable number.

22001201021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22001201021 is an equidigital number, since it uses as much as digits as its factorization.

22001201021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 22001201021 its reverse (12010210022), we get a palindrome (34011411043).

Subtracting from 22001201021 its reverse (12010210022), we obtain a palindrome (9990990999).

The spelling of 22001201021 in words is "twenty-two billion, one million, two hundred one thousand, twenty-one".