1012102020091 has 4 divisors (see below), whose sum is σ = 1044750472384. Its totient is φ = 979453567800.

The previous prime is 1012102020073. The next prime is 1012102020101. The reversal of 1012102020091 is 1900202012101.

It is a happy number.

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 1012102020091 - 2²⁵ = 1012068465659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1012102020191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16324226100 + ... + 16324226161.

It is an arithmetic number, because the mean of its divisors is an integer number (261187618096).

Almost surely, 2^{1012102020091} is an apocalyptic number.

1012102020091 is a deficient number, since it is larger than the sum of its proper divisors (32648452293).

1012102020091 is an equidigital number, since it uses as much as digits as its factorization.

1012102020091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32648452292.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1012102020091 its reverse (1900202012101), we get a palindrome (2912304032192).

The spelling of 1012102020091 in words is "one trillion, twelve billion, one hundred two million, twenty thousand, ninety-one".