20454121199 has 2 divisors, whose sum is σ = 20454121200. Its totient is φ = 20454121198.

The previous prime is 20454121157. The next prime is 20454121201. The reversal of 20454121199 is 99112145402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20454121199 is a prime.

Together with 20454121201, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20454921199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10227060599 + 10227060600.

It is an arithmetic number, because the mean of its divisors is an integer number (10227060600).

Almost surely, 2^20454121199 is an apocalyptic number.

20454121199 is a deficient number, since it is larger than the sum of its proper divisors (1).

20454121199 is an equidigital number, since it uses as much as digits as its factorization.

20454121199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 38.

The spelling of 20454121199 in words is "twenty billion, four hundred fifty-four million, one hundred twenty-one thousand, one hundred ninety-nine".