21120222019997 has 2 divisors, whose sum is σ = 21120222019998. Its totient is φ = 21120222019996.

The previous prime is 21120222019993. The next prime is 21120222020041. The reversal of 21120222019997 is 79991022202112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19767325034116 + 1352896985881 = 4446046^2 + 1163141^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120222019997 - 2² = 21120222019993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120222019993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560111009998 + 10560111009999.

It is an arithmetic number, because the mean of its divisors is an integer number (10560111009999).

Almost surely, 2^{21120222019997} is an apocalyptic number.

It is an amenable number.

21120222019997 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120222019997 is an equidigital number, since it uses as much as digits as its factorization.

21120222019997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 47.

The spelling of 21120222019997 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-two million, nineteen thousand, nine hundred ninety-seven".