21392986915111 has 4 divisors (see below), whose sum is σ = 24449127902992. Its totient is φ = 18336845927232.

The previous prime is 21392986915049. The next prime is 21392986915127. The reversal of 21392986915111 is 11151968929312.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-21392986915111 is a prime.

It is a super-2 number, since 2×21392986915111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21392986915211) 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, 1528070493930 + ... + 1528070493943.

It is an arithmetic number, because the mean of its divisors is an integer number (6112281975748).

Almost surely, 2^{21392986915111} is an apocalyptic number.

21392986915111 is a deficient number, since it is larger than the sum of its proper divisors (3056140987881).

21392986915111 is an equidigital number, since it uses as much as digits as its factorization.

21392986915111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3056140987880.

The product of its digits is 2099520, while the sum is 58.

The spelling of 21392986915111 in words is "twenty-one trillion, three hundred ninety-two billion, nine hundred eighty-six million, nine hundred fifteen thousand, one hundred eleven".