21225746743 has 2 divisors, whose sum is σ = 21225746744. Its totient is φ = 21225746742.

The previous prime is 21225746741. The next prime is 21225746749. The reversal of 21225746743 is 34764752212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21225746743 - 2¹ = 21225746741 is a prime.

Together with 21225746741, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21225746743.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21225746741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10612873371 + 10612873372.

It is an arithmetic number, because the mean of its divisors is an integer number (10612873372).

Almost surely, 2^21225746743 is an apocalyptic number.

21225746743 is a deficient number, since it is larger than the sum of its proper divisors (1).

21225746743 is an equidigital number, since it uses as much as digits as its factorization.

21225746743 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 43.

The spelling of 21225746743 in words is "twenty-one billion, two hundred twenty-five million, seven hundred forty-six thousand, seven hundred forty-three".