21400430023 has 16 divisors (see below), whose sum is σ = 24573254400. Its totient is φ = 18256709376.

The previous prime is 21400429949. The next prime is 21400430083. The reversal of 21400430023 is 32003400412.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21400430023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400430083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1359703 + ... + 1375351.

It is an arithmetic number, because the mean of its divisors is an integer number (1535828400).

Almost surely, 2^21400430023 is an apocalyptic number.

21400430023 is a deficient number, since it is larger than the sum of its proper divisors (3172824377).

21400430023 is a wasteful number, since it uses less digits than its factorization.

21400430023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16566.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 21400430023 its reverse (32003400412), we get a palindrome (53403830435).

The spelling of 21400430023 in words is "twenty-one billion, four hundred million, four hundred thirty thousand, twenty-three".