1001212210091 has 8 divisors (see below), whose sum is σ = 1003774493568. Its totient is φ = 998650800000.

The previous prime is 1001212210073. The next prime is 1001212210099. The reversal of 1001212210091 is 1900122121001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1001212210091 - 2⁶ = 1001212210027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001212210099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2108966 + ... + 2539716.

It is an arithmetic number, because the mean of its divisors is an integer number (125471811696).

Almost surely, 2^{1001212210091} is an apocalyptic number.

1001212210091 is a deficient number, since it is larger than the sum of its proper divisors (2562283477).

1001212210091 is an equidigital number, since it uses as much as digits as its factorization.

1001212210091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436693.

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

Adding to 1001212210091 its reverse (1900122121001), we get a palindrome (2901334331092).

The spelling of 1001212210091 in words is "one trillion, one billion, two hundred twelve million, two hundred ten thousand, ninety-one".