21294243127 has 2 divisors, whose sum is σ = 21294243128. Its totient is φ = 21294243126.

The previous prime is 21294243119. The next prime is 21294243143. The reversal of 21294243127 is 72134249212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21294243127 - 2³ = 21294243119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21294243427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10647121563 + 10647121564.

It is an arithmetic number, because the mean of its divisors is an integer number (10647121564).

Almost surely, 2^21294243127 is an apocalyptic number.

21294243127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21294243127 is an equidigital number, since it uses as much as digits as its factorization.

21294243127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 37.

The spelling of 21294243127 in words is "twenty-one billion, two hundred ninety-four million, two hundred forty-three thousand, one hundred twenty-seven".