1911112111021 has 4 divisors (see below), whose sum is σ = 1912606336000. Its totient is φ = 1909617886044.

The previous prime is 1911112111019. The next prime is 1911112111037. The reversal of 1911112111021 is 1201112111191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1911112111021 - 2¹ = 1911112111019 is a prime.

It is a super-2 number, since 2×1911112111021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1911112110983 and 1911112111001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1911112111921) 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, 747110571 + ... + 747113128.

It is an arithmetic number, because the mean of its divisors is an integer number (478151584000).

Almost surely, 2^{1911112111021} is an apocalyptic number.

It is an amenable number.

1911112111021 is a deficient number, since it is larger than the sum of its proper divisors (1494224979).

1911112111021 is a wasteful number, since it uses less digits than its factorization.

1911112111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494224978.

The product of its (nonzero) digits is 36, while the sum is 22.

The spelling of 1911112111021 in words is "one trillion, nine hundred eleven billion, one hundred twelve million, one hundred eleven thousand, twenty-one".