21113947927 has 2 divisors, whose sum is σ = 21113947928. Its totient is φ = 21113947926.

The previous prime is 21113947919. The next prime is 21113948029. The reversal of 21113947927 is 72974931112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21113947927 - 2³ = 21113947919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21113917927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556973963 + 10556973964.

It is an arithmetic number, because the mean of its divisors is an integer number (10556973964).

Almost surely, 2^21113947927 is an apocalyptic number.

21113947927 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113947927 is an equidigital number, since it uses as much as digits as its factorization.

21113947927 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 46.

The spelling of 21113947927 in words is "twenty-one billion, one hundred thirteen million, nine hundred forty-seven thousand, nine hundred twenty-seven".