21404422323997 has 2 divisors, whose sum is σ = 21404422323998. Its totient is φ = 21404422323996.

The previous prime is 21404422323971. The next prime is 21404422324027. The reversal of 21404422323997 is 79932322440412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14555911278841 + 6848511045156 = 3815221^2 + 2616966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21404422323997 is a prime.

It is a super-2 number, since 2×21404422323997² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21404422323937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702211161998 + 10702211161999.

It is an arithmetic number, because the mean of its divisors is an integer number (10702211161999).

Almost surely, 2^{21404422323997} is an apocalyptic number.

It is an amenable number.

21404422323997 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404422323997 is an equidigital number, since it uses as much as digits as its factorization.

21404422323997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5225472, while the sum is 52.

The spelling of 21404422323997 in words is "twenty-one trillion, four hundred four billion, four hundred twenty-two million, three hundred twenty-three thousand, nine hundred ninety-seven".