21123401471 has 2 divisors, whose sum is σ = 21123401472. Its totient is φ = 21123401470.

The previous prime is 21123401461. The next prime is 21123401543. The reversal of 21123401471 is 17410432112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21123401471 - 2³⁴ = 3943532287 is a prime.

It is a super-3 number, since 3×21123401471³ (a number of 32 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21123401471.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21123401461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561700735 + 10561700736.

It is an arithmetic number, because the mean of its divisors is an integer number (10561700736).

Almost surely, 2^21123401471 is an apocalyptic number.

21123401471 is a deficient number, since it is larger than the sum of its proper divisors (1).

21123401471 is an equidigital number, since it uses as much as digits as its factorization.

21123401471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

Adding to 21123401471 its reverse (17410432112), we get a palindrome (38533833583).

The spelling of 21123401471 in words is "twenty-one billion, one hundred twenty-three million, four hundred one thousand, four hundred seventy-one".