1223347945021 has 2 divisors, whose sum is σ = 1223347945022. Its totient is φ = 1223347945020.

The previous prime is 1223347944997. The next prime is 1223347945091. The reversal of 1223347945021 is 1205497433221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1221632825625 + 1715119396 = 1105275^2 + 41414^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223347945021 - 2²⁹ = 1222811074109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223347945091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611673972510 + 611673972511.

It is an arithmetic number, because the mean of its divisors is an integer number (611673972511).

Almost surely, 2^{1223347945021} is an apocalyptic number.

It is an amenable number.

1223347945021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223347945021 is an equidigital number, since it uses as much as digits as its factorization.

1223347945021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 1223347945021 in words is "one trillion, two hundred twenty-three billion, three hundred forty-seven million, nine hundred forty-five thousand, twenty-one".