21667349027 has 2 divisors, whose sum is σ = 21667349028. Its totient is φ = 21667349026.

The previous prime is 21667349021. The next prime is 21667349087. The reversal of 21667349027 is 72094376612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21667349027 - 2²⁶ = 21600240163 is a prime.

It is not a weakly prime, because it can be changed into another prime (21667349021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10833674513 + 10833674514.

It is an arithmetic number, because the mean of its divisors is an integer number (10833674514).

Almost surely, 2^21667349027 is an apocalyptic number.

21667349027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21667349027 is an equidigital number, since it uses as much as digits as its factorization.

21667349027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048, while the sum is 47.

The spelling of 21667349027 in words is "twenty-one billion, six hundred sixty-seven million, three hundred forty-nine thousand, twenty-seven".