21371113111 has 4 divisors (see below), whose sum is σ = 21371845824. Its totient is φ = 21370380400.

The previous prime is 21371113091. The next prime is 21371113121. The reversal of 21371113111 is 11131117312.

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 21371113111 - 2¹³ = 21371104919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21371113121) 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, 320710 + ... + 381571.

It is an arithmetic number, because the mean of its divisors is an integer number (5342961456).

Almost surely, 2^21371113111 is an apocalyptic number.

21371113111 is a deficient number, since it is larger than the sum of its proper divisors (732713).

21371113111 is an equidigital number, since it uses as much as digits as its factorization.

21371113111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732712.

The product of its digits is 126, while the sum is 22.

The spelling of 21371113111 in words is "twenty-one billion, three hundred seventy-one million, one hundred thirteen thousand, one hundred eleven".