20091910919091 has 24 divisors (see below), whose sum is σ = 29458816718352. Its totient is φ = 12171613977600.

The previous prime is 20091910919081. The next prime is 20091910919131. The reversal of 20091910919091 is 19091901919002.

It is not a de Polignac number, because 20091910919091 - 2⁹ = 20091910918579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20091910919051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11214430 + ... + 12882051.

It is an arithmetic number, because the mean of its divisors is an integer number (1227450696598).

Almost surely, 2^{20091910919091} is an apocalyptic number.

20091910919091 is a deficient number, since it is larger than the sum of its proper divisors (9366905799261).

20091910919091 is a wasteful number, since it uses less digits than its factorization.

20091910919091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24098803 (or 24098792 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 51.

The spelling of 20091910919091 in words is "twenty trillion, ninety-one billion, nine hundred ten million, nine hundred nineteen thousand, ninety-one".