1113220120421 has 4 divisors (see below), whose sum is σ = 1113565736844. Its totient is φ = 1112874504000.

The previous prime is 1113220120403. The next prime is 1113220120457. The reversal of 1113220120421 is 1240210223111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 855465907396 + 257754213025 = 924914^2 + 507695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1113220120421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1113220120393 and 1113220120402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1113220120021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172803380 + ... + 172809821.

It is an arithmetic number, because the mean of its divisors is an integer number (278391434211).

Almost surely, 2^{1113220120421} is an apocalyptic number.

It is an amenable number.

1113220120421 is a deficient number, since it is larger than the sum of its proper divisors (345616423).

1113220120421 is an equidigital number, since it uses as much as digits as its factorization.

1113220120421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345616422.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1113220120421 its reverse (1240210223111), we get a palindrome (2353430343532).

The spelling of 1113220120421 in words is "one trillion, one hundred thirteen billion, two hundred twenty million, one hundred twenty thousand, four hundred twenty-one".