721221105743 has 2 divisors, whose sum is σ = 721221105744. Its totient is φ = 721221105742.

The previous prime is 721221105739. The next prime is 721221105751. The reversal of 721221105743 is 347501122127.

721221105743 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721221105743 - 2² = 721221105739 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721221105443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360610552871 + 360610552872.

It is an arithmetic number, because the mean of its divisors is an integer number (360610552872).

Almost surely, 2^721221105743 is an apocalyptic number.

721221105743 is a deficient number, since it is larger than the sum of its proper divisors (1).

721221105743 is an equidigital number, since it uses as much as digits as its factorization.

721221105743 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520, while the sum is 35.

The spelling of 721221105743 in words is "seven hundred twenty-one billion, two hundred twenty-one million, one hundred five thousand, seven hundred forty-three".