11420121997 has 4 divisors (see below), whose sum is σ = 11495752096. Its totient is φ = 11344491900.

The previous prime is 11420121941. The next prime is 11420122031. The reversal of 11420121997 is 79912102411.

It is a happy number.

11420121997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11420121997 - 2¹⁵ = 11420089229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11420121917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37814823 + ... + 37815124.

It is an arithmetic number, because the mean of its divisors is an integer number (2873938024).

Almost surely, 2^11420121997 is an apocalyptic number.

It is an amenable number.

11420121997 is a deficient number, since it is larger than the sum of its proper divisors (75630099).

11420121997 is an equidigital number, since it uses as much as digits as its factorization.

11420121997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75630098.

The product of its (nonzero) digits is 9072, while the sum is 37.

The spelling of 11420121997 in words is "eleven billion, four hundred twenty million, one hundred twenty-one thousand, nine hundred ninety-seven".