1311122421 has 12 divisors (see below), whose sum is σ = 2164392672. Its totient is φ = 749212776.

The previous prime is 1311122419. The next prime is 1311122431. The reversal of 1311122421 is 1242211131.

1311122421 is a `hidden beast` number, since 131 + 112 + 2 + 421 = 666.

1311122421 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1311122421 - 2¹ = 1311122419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311122394 and 1311122403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311122431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10405671 + ... + 10405796.

It is an arithmetic number, because the mean of its divisors is an integer number (180366056).

Almost surely, 2^1311122421 is an apocalyptic number.

It is an amenable number.

1311122421 is a deficient number, since it is larger than the sum of its proper divisors (853270251).

1311122421 is a wasteful number, since it uses less digits than its factorization.

1311122421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20811480 (or 20811477 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 1311122421 is about 36209.4244776136. The cubic root of 1311122421 is about 1094.4965947758.

Adding to 1311122421 its reverse (1242211131), we get a palindrome (2553333552).

The spelling of 1311122421 in words is "one billion, three hundred eleven million, one hundred twenty-two thousand, four hundred twenty-one".