1131121421 has 4 divisors (see below), whose sum is σ = 1131189312. Its totient is φ = 1131053532.

The previous prime is 1131121417. The next prime is 1131121451. The reversal of 1131121421 is 1241211311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1131121421 - 2² = 1131121417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1131121421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131121451) 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, 10076 + ... + 48618.

It is an arithmetic number, because the mean of its divisors is an integer number (282797328).

Almost surely, 2^1131121421 is an apocalyptic number.

It is an amenable number.

1131121421 is a deficient number, since it is larger than the sum of its proper divisors (67891).

1131121421 is an equidigital number, since it uses as much as digits as its factorization.

1131121421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67890.

The product of its digits is 48, while the sum is 17.

The square root of 1131121421 is about 33632.1486230065. The cubic root of 1131121421 is about 1041.9248809627.

Adding to 1131121421 its reverse (1241211311), we get a palindrome (2372332732).

The spelling of 1131121421 in words is "one billion, one hundred thirty-one million, one hundred twenty-one thousand, four hundred twenty-one".