1012200021191 has 4 divisors (see below), whose sum is σ = 1012807221432. Its totient is φ = 1011592820952.

The previous prime is 1012200021187. The next prime is 1012200021193. The reversal of 1012200021191 is 1911200022101.

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 1012200021191 - 2² = 1012200021187 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 (1012200021193) 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, 303597620 + ... + 303600953.

It is an arithmetic number, because the mean of its divisors is an integer number (253201805358).

Almost surely, 2^{1012200021191} is an apocalyptic number.

1012200021191 is a deficient number, since it is larger than the sum of its proper divisors (607200241).

1012200021191 is an equidigital number, since it uses as much as digits as its factorization.

1012200021191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607200240.

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

Adding to 1012200021191 its reverse (1911200022101), we get a palindrome (2923400043292).

The spelling of 1012200021191 in words is "one trillion, twelve billion, two hundred million, twenty-one thousand, one hundred ninety-one".