20401109999 has 2 divisors, whose sum is σ = 20401110000. Its totient is φ = 20401109998.

The previous prime is 20401109977. The next prime is 20401110011. The reversal of 20401109999 is 99990110402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20401109999 - 2¹² = 20401105903 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20401109699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200554999 + 10200555000.

It is an arithmetic number, because the mean of its divisors is an integer number (10200555000).

Almost surely, 2^20401109999 is an apocalyptic number.

20401109999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401109999 is an equidigital number, since it uses as much as digits as its factorization.

20401109999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 44.

The spelling of 20401109999 in words is "twenty billion, four hundred one million, one hundred nine thousand, nine hundred ninety-nine".