21142399799 has 2 divisors, whose sum is σ = 21142399800. Its totient is φ = 21142399798.

The previous prime is 21142399793. The next prime is 21142399829. The reversal of 21142399799 is 99799324112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21142399799 - 2⁸ = 21142399543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21142399793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571199899 + 10571199900.

It is an arithmetic number, because the mean of its divisors is an integer number (10571199900).

Almost surely, 2^21142399799 is an apocalyptic number.

21142399799 is a deficient number, since it is larger than the sum of its proper divisors (1).

21142399799 is an equidigital number, since it uses as much as digits as its factorization.

21142399799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2204496, while the sum is 56.

The spelling of 21142399799 in words is "twenty-one billion, one hundred forty-two million, three hundred ninety-nine thousand, seven hundred ninety-nine".