21104274727 has 2 divisors, whose sum is σ = 21104274728. Its totient is φ = 21104274726.

The previous prime is 21104274721. The next prime is 21104274773. The reversal of 21104274727 is 72747240112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21104274727 - 2²⁷ = 20970056999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21104274721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10552137363 + 10552137364.

It is an arithmetic number, because the mean of its divisors is an integer number (10552137364).

Almost surely, 2^21104274727 is an apocalyptic number.

21104274727 is a deficient number, since it is larger than the sum of its proper divisors (1).

21104274727 is an equidigital number, since it uses as much as digits as its factorization.

21104274727 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43904, while the sum is 37.

The spelling of 21104274727 in words is "twenty-one billion, one hundred four million, two hundred seventy-four thousand, seven hundred twenty-seven".