21147126479 has 2 divisors, whose sum is σ = 21147126480. Its totient is φ = 21147126478.

The previous prime is 21147126397. The next prime is 21147126491. The reversal of 21147126479 is 97462174112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21147126479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21147126499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10573563239 + 10573563240.

It is an arithmetic number, because the mean of its divisors is an integer number (10573563240).

Almost surely, 2^21147126479 is an apocalyptic number.

21147126479 is a deficient number, since it is larger than the sum of its proper divisors (1).

21147126479 is an equidigital number, since it uses as much as digits as its factorization.

21147126479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 44.

The spelling of 21147126479 in words is "twenty-one billion, one hundred forty-seven million, one hundred twenty-six thousand, four hundred seventy-nine".