21553251004199 has 2 divisors, whose sum is σ = 21553251004200. Its totient is φ = 21553251004198.

The previous prime is 21553251004177. The next prime is 21553251004279. The reversal of 21553251004199 is 99140015235512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21553251004199 - 2⁸ = 21553251003943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21553251004499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10776625502099 + 10776625502100.

It is an arithmetic number, because the mean of its divisors is an integer number (10776625502100).

Almost surely, 2^{21553251004199} is an apocalyptic number.

21553251004199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21553251004199 is an equidigital number, since it uses as much as digits as its factorization.

21553251004199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486000, while the sum is 47.

The spelling of 21553251004199 in words is "twenty-one trillion, five hundred fifty-three billion, two hundred fifty-one million, four thousand, one hundred ninety-nine".