20121799699 has 2 divisors, whose sum is σ = 20121799700. Its totient is φ = 20121799698.

The previous prime is 20121799679. The next prime is 20121799717. The reversal of 20121799699 is 99699712102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20121799699 - 2⁷ = 20121799571 is a prime.

It is not a weakly prime, because it can be changed into another prime (20121799679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060899849 + 10060899850.

It is an arithmetic number, because the mean of its divisors is an integer number (10060899850).

Almost surely, 2^20121799699 is an apocalyptic number.

20121799699 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121799699 is an equidigital number, since it uses as much as digits as its factorization.

20121799699 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1102248, while the sum is 55.

The spelling of 20121799699 in words is "twenty billion, one hundred twenty-one million, seven hundred ninety-nine thousand, six hundred ninety-nine".