123221947643 has 2 divisors, whose sum is σ = 123221947644. Its totient is φ = 123221947642.

The previous prime is 123221947573. The next prime is 123221947663. The reversal of 123221947643 is 346749122321.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123221947643 - 2¹⁶ = 123221882107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123221947594 and 123221947603.

It is not a weakly prime, because it can be changed into another prime (123221947663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61610973821 + 61610973822.

It is an arithmetic number, because the mean of its divisors is an integer number (61610973822).

Almost surely, 2^123221947643 is an apocalyptic number.

123221947643 is a deficient number, since it is larger than the sum of its proper divisors (1).

123221947643 is an equidigital number, since it uses as much as digits as its factorization.

123221947643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 44.

The spelling of 123221947643 in words is "one hundred twenty-three billion, two hundred twenty-one million, nine hundred forty-seven thousand, six hundred forty-three".