1001121210091 has 4 divisors (see below), whose sum is σ = 1001312744152. Its totient is φ = 1000929676032.

The previous prime is 1001121210079. The next prime is 1001121210107. The reversal of 1001121210091 is 1900121211001.

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 1001121210091 - 2⁹ = 1001121209579 is a prime.

It is a super-4 number, since 4×1001121210091⁴ (a number of 49 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001121210041) 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, 95759190 + ... + 95769643.

It is an arithmetic number, because the mean of its divisors is an integer number (250328186038).

Almost surely, 2^{1001121210091} is an apocalyptic number.

1001121210091 is a deficient number, since it is larger than the sum of its proper divisors (191534061).

1001121210091 is an equidigital number, since it uses as much as digits as its factorization.

1001121210091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191534060.

The product of its (nonzero) digits is 36, while the sum is 19.

Adding to 1001121210091 its reverse (1900121211001), we get a palindrome (2901242421092).

The spelling of 1001121210091 in words is "one trillion, one billion, one hundred twenty-one million, two hundred ten thousand, ninety-one".