21332120220991 has 2 divisors, whose sum is σ = 21332120220992. Its totient is φ = 21332120220990.

The previous prime is 21332120220989. The next prime is 21332120221003. The reversal of 21332120220991 is 19902202123312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21332120220991 - 2¹ = 21332120220989 is a prime.

It is a super-2 number, since 2×21332120220991² (a number of 27 digits) contains 22 as substring.

Together with 21332120220989, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21332120220991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21332120220911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666060110495 + 10666060110496.

It is an arithmetic number, because the mean of its divisors is an integer number (10666060110496).

Almost surely, 2^{21332120220991} is an apocalyptic number.

21332120220991 is a deficient number, since it is larger than the sum of its proper divisors (1).

21332120220991 is an equidigital number, since it uses as much as digits as its factorization.

21332120220991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

The spelling of 21332120220991 in words is "twenty-one trillion, three hundred thirty-two billion, one hundred twenty million, two hundred twenty thousand, nine hundred ninety-one".