1020011112191 has 4 divisors (see below), whose sum is σ = 1020299825352. Its totient is φ = 1019722399032.

The previous prime is 1020011112187. The next prime is 1020011112193. The reversal of 1020011112191 is 1912111100201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1020011112191 - 2² = 1020011112187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020011112193) 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, 144351281 + ... + 144358346.

It is an arithmetic number, because the mean of its divisors is an integer number (255074956338).

Almost surely, 2^{1020011112191} is an apocalyptic number.

1020011112191 is a deficient number, since it is larger than the sum of its proper divisors (288713161).

1020011112191 is an equidigital number, since it uses as much as digits as its factorization.

1020011112191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288713160.

The product of its (nonzero) digits is 36, while the sum is 20.

Adding to 1020011112191 its reverse (1912111100201), we get a palindrome (2932122212392).

The spelling of 1020011112191 in words is "one trillion, twenty billion, eleven million, one hundred twelve thousand, one hundred ninety-one".