21404220743 has 2 divisors, whose sum is σ = 21404220744. Its totient is φ = 21404220742.

The previous prime is 21404220707. The next prime is 21404220749. The reversal of 21404220743 is 34702240412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21404220743 - 2¹⁴ = 21404204359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21404220749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702110371 + 10702110372.

It is an arithmetic number, because the mean of its divisors is an integer number (10702110372).

Almost surely, 2^21404220743 is an apocalyptic number.

21404220743 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404220743 is an equidigital number, since it uses as much as digits as its factorization.

21404220743 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 29.

The spelling of 21404220743 in words is "twenty-one billion, four hundred four million, two hundred twenty thousand, seven hundred forty-three".