26229472721 has 2 divisors, whose sum is σ = 26229472722. Its totient is φ = 26229472720.

The previous prime is 26229472673. The next prime is 26229472813. The reversal of 26229472721 is 12727492262.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25617603025 + 611869696 = 160055^2 + 24736^2 .

It is a cyclic number.

It is not a de Polignac number, because 26229472721 - 2⁶ = 26229472657 is a prime.

It is not a weakly prime, because it can be changed into another prime (26229412721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13114736360 + 13114736361.

It is an arithmetic number, because the mean of its divisors is an integer number (13114736361).

Almost surely, 2^26229472721 is an apocalyptic number.

It is an amenable number.

26229472721 is a deficient number, since it is larger than the sum of its proper divisors (1).

26229472721 is an equidigital number, since it uses as much as digits as its factorization.

26229472721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 44.

The spelling of 26229472721 in words is "twenty-six billion, two hundred twenty-nine million, four hundred seventy-two thousand, seven hundred twenty-one".