7901111221111 has 4 divisors (see below), whose sum is σ = 7903535621800. Its totient is φ = 7898686820424.

The previous prime is 7901111221109. The next prime is 7901111221147. The reversal of 7901111221111 is 1111221111097.

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 7901111221111 - 2¹ = 7901111221109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7901111221111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7901111221181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1212195456 + ... + 1212201973.

It is an arithmetic number, because the mean of its divisors is an integer number (1975883905450).

Almost surely, 2^{7901111221111} is an apocalyptic number.

7901111221111 is a deficient number, since it is larger than the sum of its proper divisors (2424400689).

7901111221111 is a wasteful number, since it uses less digits than its factorization.

7901111221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2424400688.

The product of its (nonzero) digits is 252, while the sum is 28.

The spelling of 7901111221111 in words is "seven trillion, nine hundred one billion, one hundred eleven million, two hundred twenty-one thousand, one hundred eleven".