20211121119997 has 2 divisors, whose sum is σ = 20211121119998. Its totient is φ = 20211121119996.

The previous prime is 20211121119991. The next prime is 20211121120031. The reversal of 20211121119997 is 79991112111202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19797284943396 + 413836176601 = 4449414^2 + 643301^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211121119997 - 2¹¹ = 20211121117949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211121119991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105560559998 + 10105560559999.

It is an arithmetic number, because the mean of its divisors is an integer number (10105560559999).

Almost surely, 2^{20211121119997} is an apocalyptic number.

It is an amenable number.

20211121119997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211121119997 is an equidigital number, since it uses as much as digits as its factorization.

20211121119997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 46.

The spelling of 20211121119997 in words is "twenty trillion, two hundred eleven billion, one hundred twenty-one million, one hundred nineteen thousand, nine hundred ninety-seven".