20210111993 has 8 divisors (see below), whose sum is σ = 20248132800. Its totient is φ = 20172124080.

The previous prime is 20210111981. The next prime is 20210112017. The reversal of 20210111993 is 39911101202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20210111993 - 2⁸ = 20210111737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20210111953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1457708 + ... + 1471506.

It is an arithmetic number, because the mean of its divisors is an integer number (2531016600).

Almost surely, 2^20210111993 is an apocalyptic number.

It is an amenable number.

20210111993 is a deficient number, since it is larger than the sum of its proper divisors (38020807).

20210111993 is a wasteful number, since it uses less digits than its factorization.

20210111993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16447.

The product of its (nonzero) digits is 972, while the sum is 29.

The spelling of 20210111993 in words is "twenty billion, two hundred ten million, one hundred eleven thousand, nine hundred ninety-three".