1321124421 has 4 divisors (see below), whose sum is σ = 1761499232.
Its totient is φ = 880749612.
The previous prime is 1321124419. The next prime is 1321124447. The reversal of 1321124421 is 1244211231.
1321124421 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.
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.
It is not a de Polignac number, because 1321124421 - 21 = 1321124419 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1321124411) 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, 220187401 + ... + 220187406.
It is an arithmetic number, because the mean of its divisors is an integer number (440374808).
Almost surely, 21321124421 is an apocalyptic number.
It is an amenable number.
1321124421 is a deficient number, since it is larger than the sum of its proper divisors (440374811).
1321124421 is an equidigital number, since it uses as much as digits as its factorization.
1321124421 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 440374810.
The product of its digits is 384, while the sum is 21.
The square root of 1321124421 is about 36347.2752899031.
The cubic root of 1321124421 is about 1097.2726984332.
Adding to 1321124421 its reverse (1244211231), we get a palindrome (2565335652).
The spelling of 1321124421 in words is "one billion, three hundred twenty-one million, one hundred twenty-four thousand, four hundred twenty-one".