20211111999943 has 2 divisors, whose sum is σ = 20211111999944. Its totient is φ = 20211111999942.

The previous prime is 20211111999833. The next prime is 20211112000019. The reversal of 20211111999943 is 34999911111202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20211111999943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211111999643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105555999971 + 10105555999972.

It is an arithmetic number, because the mean of its divisors is an integer number (10105555999972).

Almost surely, 2^{20211111999943} is an apocalyptic number.

20211111999943 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211111999943 is an equidigital number, since it uses as much as digits as its factorization.

20211111999943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 52.

The spelling of 20211111999943 in words is "twenty trillion, two hundred eleven billion, one hundred eleven million, nine hundred ninety-nine thousand, nine hundred forty-three".