105212754991 has 4 divisors (see below), whose sum is σ = 105213452800. Its totient is φ = 105212057184.

The previous prime is 105212754973. The next prime is 105212755003. The reversal of 105212754991 is 199457212501.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 105212754991 - 2²⁵ = 105179200559 is a prime.

It is a super-2 number, since 2×105212754991² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105212754091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18351 + ... + 459088.

It is an arithmetic number, because the mean of its divisors is an integer number (26303363200).

Almost surely, 2^105212754991 is an apocalyptic number.

105212754991 is a deficient number, since it is larger than the sum of its proper divisors (697809).

105212754991 is an equidigital number, since it uses as much as digits as its factorization.

105212754991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697808.

The product of its (nonzero) digits is 226800, while the sum is 46.

The spelling of 105212754991 in words is "one hundred five billion, two hundred twelve million, seven hundred fifty-four thousand, nine hundred ninety-one".