21301244431 has 2 divisors, whose sum is σ = 21301244432. Its totient is φ = 21301244430.

The previous prime is 21301244429. The next prime is 21301244441. The reversal of 21301244431 is 13444210312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21301244431 - 2¹ = 21301244429 is a prime.

It is a super-2 number, since 2×21301244431² (a number of 21 digits) contains 22 as substring.

Together with 21301244429, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21301244396 and 21301244405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21301244441) 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 as a sum of consecutive naturals, namely, 10650622215 + 10650622216.

It is an arithmetic number, because the mean of its divisors is an integer number (10650622216).

Almost surely, 2^21301244431 is an apocalyptic number.

21301244431 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301244431 is an equidigital number, since it uses as much as digits as its factorization.

21301244431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21301244431 its reverse (13444210312), we get a palindrome (34745454743).

The spelling of 21301244431 in words is "twenty-one billion, three hundred one million, two hundred forty-four thousand, four hundred thirty-one".