21334400431 has 2 divisors, whose sum is σ = 21334400432. Its totient is φ = 21334400430.

The previous prime is 21334400407. The next prime is 21334400443. The reversal of 21334400431 is 13400443312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21334400431 - 2⁷ = 21334400303 is a prime.

It is a super-2 number, since 2×21334400431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21334400396 and 21334400405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21334410431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10667200215 + 10667200216.

It is an arithmetic number, because the mean of its divisors is an integer number (10667200216).

Almost surely, 2^21334400431 is an apocalyptic number.

21334400431 is a deficient number, since it is larger than the sum of its proper divisors (1).

21334400431 is an equidigital number, since it uses as much as digits as its factorization.

21334400431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21334400431 its reverse (13400443312), we get a palindrome (34734843743).

The spelling of 21334400431 in words is "twenty-one billion, three hundred thirty-four million, four hundred thousand, four hundred thirty-one".