11000121997 has 2 divisors, whose sum is σ = 11000121998. Its totient is φ = 11000121996.

The previous prime is 11000121973. The next prime is 11000122027. The reversal of 11000121997 is 79912100011.

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., 8283002121 + 2717119876 = 91011^2 + 52126^2 .

It is a cyclic number.

It is not a de Polignac number, because 11000121997 - 2¹⁵ = 11000089229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11000121907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5500060998 + 5500060999.

It is an arithmetic number, because the mean of its divisors is an integer number (5500060999).

Almost surely, 2^11000121997 is an apocalyptic number.

It is an amenable number.

11000121997 is a deficient number, since it is larger than the sum of its proper divisors (1).

11000121997 is an equidigital number, since it uses as much as digits as its factorization.

11000121997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 31.

The spelling of 11000121997 in words is "eleven billion, one hundred twenty-one thousand, nine hundred ninety-seven".