1123421312421 has 24 divisors (see below), whose sum is σ = 1719712237464. Its totient is φ = 704260638720.

The previous prime is 1123421312417. The next prime is 1123421312437. The reversal of 1123421312421 is 1242131243211.

1123421312421 is a `hidden beast` number, since 1 + 1 + 2 + 342 + 1 + 312 + 4 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7239627396 + 1116181685025 = 85086^2 + 1056495^2 .

It is not a de Polignac number, because 1123421312421 - 2² = 1123421312417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123421312471) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3115860 + ... + 3457661.

It is an arithmetic number, because the mean of its divisors is an integer number (71654676561).

Almost surely, 2^{1123421312421} is an apocalyptic number.

It is an amenable number.

1123421312421 is a deficient number, since it is larger than the sum of its proper divisors (596290925043).

1123421312421 is a wasteful number, since it uses less digits than its factorization.

1123421312421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6574661 (or 6574658 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

Adding to 1123421312421 its reverse (1242131243211), we get a palindrome (2365552555632).

It can be divided in two parts, 11 and 23421312421, that added together give a palindrome (23421312432).

The spelling of 1123421312421 in words is "one trillion, one hundred twenty-three billion, four hundred twenty-one million, three hundred twelve thousand, four hundred twenty-one".