21400404023 has 2 divisors, whose sum is σ = 21400404024. Its totient is φ = 21400404022.

The previous prime is 21400404013. The next prime is 21400404041. The reversal of 21400404023 is 32040400412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21400404023 - 2¹⁴ = 21400387639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21400403986 and 21400404004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21400404013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700202011 + 10700202012.

It is an arithmetic number, because the mean of its divisors is an integer number (10700202012).

Almost surely, 2^21400404023 is an apocalyptic number.

21400404023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21400404023 is an equidigital number, since it uses as much as digits as its factorization.

21400404023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21400404023 its reverse (32040400412), we get a palindrome (53440804435).

The spelling of 21400404023 in words is "twenty-one billion, four hundred million, four hundred four thousand, twenty-three".