21043103399 has 2 divisors, whose sum is σ = 21043103400. Its totient is φ = 21043103398.

The previous prime is 21043103381. The next prime is 21043103413. The reversal of 21043103399 is 99330134012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21043103399 - 2⁸ = 21043103143 is a prime.

It is a super-2 number, since 2×21043103399² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21043103359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10521551699 + 10521551700.

It is an arithmetic number, because the mean of its divisors is an integer number (10521551700).

Almost surely, 2^21043103399 is an apocalyptic number.

21043103399 is a deficient number, since it is larger than the sum of its proper divisors (1).

21043103399 is an equidigital number, since it uses as much as digits as its factorization.

21043103399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 35.

The spelling of 21043103399 in words is "twenty-one billion, forty-three million, one hundred three thousand, three hundred ninety-nine".