21396082471 has 2 divisors, whose sum is σ = 21396082472. Its totient is φ = 21396082470.

The previous prime is 21396082453. The next prime is 21396082493. The reversal of 21396082471 is 17428069312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21396082471 - 2¹³ = 21396074279 is a prime.

It is a super-3 number, since 3×21396082471³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21396082441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10698041235 + 10698041236.

It is an arithmetic number, because the mean of its divisors is an integer number (10698041236).

Almost surely, 2^21396082471 is an apocalyptic number.

21396082471 is a deficient number, since it is larger than the sum of its proper divisors (1).

21396082471 is an equidigital number, since it uses as much as digits as its factorization.

21396082471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 21396082471 in words is "twenty-one billion, three hundred ninety-six million, eighty-two thousand, four hundred seventy-one".