21404535023 has 2 divisors, whose sum is σ = 21404535024. Its totient is φ = 21404535022.

The previous prime is 21404535013. The next prime is 21404535041. The reversal of 21404535023 is 32053540412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21404535023 - 2¹⁶ = 21404469487 is a prime.

It is a super-2 number, since 2×21404535023² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21404535013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702267511 + 10702267512.

It is an arithmetic number, because the mean of its divisors is an integer number (10702267512).

Almost surely, 2^21404535023 is an apocalyptic number.

21404535023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404535023 is an equidigital number, since it uses as much as digits as its factorization.

21404535023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 29.

The spelling of 21404535023 in words is "twenty-one billion, four hundred four million, five hundred thirty-five thousand, twenty-three".