1123212223021 has 6 divisors (see below), whose sum is σ = 1306593810510. Its totient is φ = 962753333976.

The previous prime is 1123212222973. The next prime is 1123212223031. The reversal of 1123212223021 is 1203222123211.

It can be written as a sum of positive squares in only one way, i.e., 665302866921 + 457909356100 = 815661^2 + 676690^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1123212223021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1123212222983 and 1123212223001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123212223031) 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, 11461349166 + ... + 11461349263.

It is an arithmetic number, because the mean of its divisors is an integer number (217765635085).

Almost surely, 2^{1123212223021} is an apocalyptic number.

It is an amenable number.

1123212223021 is a deficient number, since it is larger than the sum of its proper divisors (183381587489).

1123212223021 is an equidigital number, since it uses as much as digits as its factorization.

1123212223021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22922698443 (or 22922698436 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 1123212223021 its reverse (1203222123211), we get a palindrome (2326434346232).

The spelling of 1123212223021 in words is "one trillion, one hundred twenty-three billion, two hundred twelve million, two hundred twenty-three thousand, twenty-one".