21434400523 has 2 divisors, whose sum is σ = 21434400524. Its totient is φ = 21434400522.

The previous prime is 21434400469. The next prime is 21434400527. The reversal of 21434400523 is 32500443412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21434400523 - 2⁹ = 21434400011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21434400491 and 21434400500.

It is not a weakly prime, because it can be changed into another prime (21434400527) 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, 10717200261 + 10717200262.

It is an arithmetic number, because the mean of its divisors is an integer number (10717200262).

Almost surely, 2^21434400523 is an apocalyptic number.

21434400523 is a deficient number, since it is larger than the sum of its proper divisors (1).

21434400523 is an equidigital number, since it uses as much as digits as its factorization.

21434400523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 21434400523 its reverse (32500443412), we get a palindrome (53934843935).

The spelling of 21434400523 in words is "twenty-one billion, four hundred thirty-four million, four hundred thousand, five hundred twenty-three".