1002120020191 has 4 divisors (see below), whose sum is σ = 1002139134984. Its totient is φ = 1002100905400.

The previous prime is 1002120020159. The next prime is 1002120020197. The reversal of 1002120020191 is 1910200212001.

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 1002120020191 - 2⁵ = 1002120020159 is a prime.

It is a super-2 number, since 2×1002120020191² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002120020197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9478540 + ... + 9583681.

It is an arithmetic number, because the mean of its divisors is an integer number (250534783746).

Almost surely, 2^{1002120020191} is an apocalyptic number.

1002120020191 is a deficient number, since it is larger than the sum of its proper divisors (19114793).

1002120020191 is an equidigital number, since it uses as much as digits as its factorization.

1002120020191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19114792.

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

Adding to 1002120020191 its reverse (1910200212001), we get a palindrome (2912320232192).

The spelling of 1002120020191 in words is "one trillion, two billion, one hundred twenty million, twenty thousand, one hundred ninety-one".