20421513199 has 2 divisors, whose sum is σ = 20421513200. Its totient is φ = 20421513198.

The previous prime is 20421513187. The next prime is 20421513223. The reversal of 20421513199 is 99131512402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20421513199 - 2⁷ = 20421513071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20421513169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210756599 + 10210756600.

It is an arithmetic number, because the mean of its divisors is an integer number (10210756600).

Almost surely, 2^20421513199 is an apocalyptic number.

20421513199 is a deficient number, since it is larger than the sum of its proper divisors (1).

20421513199 is an equidigital number, since it uses as much as digits as its factorization.

20421513199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 37.

The spelling of 20421513199 in words is "twenty billion, four hundred twenty-one million, five hundred thirteen thousand, one hundred ninety-nine".