1921314774111 has 4 divisors (see below), whose sum is σ = 2561753032152. Its totient is φ = 1280876516072.

The previous prime is 1921314774031. The next prime is 1921314774131. The reversal of 1921314774111 is 1114774131291.

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 1921314774111 - 2¹⁵ = 1921314741343 is a prime.

It is a super-2 number, since 2×1921314774111² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921314774131) 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, 320219129016 + ... + 320219129021.

It is an arithmetic number, because the mean of its divisors is an integer number (640438258038).

Almost surely, 2^{1921314774111} is an apocalyptic number.

1921314774111 is a deficient number, since it is larger than the sum of its proper divisors (640438258041).

1921314774111 is an equidigital number, since it uses as much as digits as its factorization.

1921314774111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640438258040.

The product of its digits is 42336, while the sum is 42.

The spelling of 1921314774111 in words is "one trillion, nine hundred twenty-one billion, three hundred fourteen million, seven hundred seventy-four thousand, one hundred eleven".