1123020323921 has 2 divisors, whose sum is σ = 1123020323922. Its totient is φ = 1123020323920.

The previous prime is 1123020323861. The next prime is 1123020323987. The reversal of 1123020323921 is 1293230203211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1055335017025 + 67685306896 = 1027295^2 + 260164^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123020323921 - 2²² = 1123016129617 is a prime.

It is a super-2 number, since 2×1123020323921² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1123020328921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561510161960 + 561510161961.

It is an arithmetic number, because the mean of its divisors is an integer number (561510161961).

Almost surely, 2^{1123020323921} is an apocalyptic number.

It is an amenable number.

1123020323921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123020323921 is an equidigital number, since it uses as much as digits as its factorization.

1123020323921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The spelling of 1123020323921 in words is "one trillion, one hundred twenty-three billion, twenty million, three hundred twenty-three thousand, nine hundred twenty-one".