1123863540821 has 6 divisors (see below), whose sum is σ = 1307351465910. Its totient is φ = 963311606376.

The previous prime is 1123863540803. The next prime is 1123863540823. The reversal of 1123863540821 is 1280453683211.

It can be written as a sum of positive squares in only one way, i.e., 1093360918321 + 30502622500 = 1045639^2 + 174650^2 .

It is not a de Polignac number, because 1123863540821 - 2¹⁸ = 1123863278677 is a prime.

It is a super-3 number, since 3×1123863540821³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123863540823) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11467995266 + ... + 11467995363.

It is an arithmetic number, because the mean of its divisors is an integer number (217891910985).

Almost surely, 2^{1123863540821} is an apocalyptic number.

It is an amenable number.

1123863540821 is a deficient number, since it is larger than the sum of its proper divisors (183487925089).

1123863540821 is an equidigital number, since it uses as much as digits as its factorization.

1123863540821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22935990643 (or 22935990636 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 44.

The spelling of 1123863540821 in words is "one trillion, one hundred twenty-three billion, eight hundred sixty-three million, five hundred forty thousand, eight hundred twenty-one".