21109938067 has 2 divisors, whose sum is σ = 21109938068. Its totient is φ = 21109938066.

The previous prime is 21109938061. The next prime is 21109938097. The reversal of 21109938067 is 76083990112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21109938067 - 2⁷ = 21109937939 is a prime.

It is not a weakly prime, because it can be changed into another prime (21109938061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10554969033 + 10554969034.

It is an arithmetic number, because the mean of its divisors is an integer number (10554969034).

Almost surely, 2^21109938067 is an apocalyptic number.

21109938067 is a deficient number, since it is larger than the sum of its proper divisors (1).

21109938067 is an equidigital number, since it uses as much as digits as its factorization.

21109938067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 46.

The spelling of 21109938067 in words is "twenty-one billion, one hundred nine million, nine hundred thirty-eight thousand, sixty-seven".