1012102120091 has 4 divisors (see below), whose sum is σ = 1012104266784. Its totient is φ = 1012099973400.

The previous prime is 1012102120033. The next prime is 1012102120109. The reversal of 1012102120091 is 1900212012101.

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 1012102120091 - 2³⁸ = 737224213147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1012102120591) 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, 24515 + ... + 1422956.

It is an arithmetic number, because the mean of its divisors is an integer number (253026066696).

Almost surely, 2^{1012102120091} is an apocalyptic number.

1012102120091 is a deficient number, since it is larger than the sum of its proper divisors (2146693).

1012102120091 is an equidigital number, since it uses as much as digits as its factorization.

1012102120091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2146692.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 1012102120091 its reverse (1900212012101), we get a palindrome (2912314132192).

The spelling of 1012102120091 in words is "one trillion, twelve billion, one hundred two million, one hundred twenty thousand, ninety-one".