1321437421 has 8 divisors (see below), whose sum is σ = 1433295864. Its totient is φ = 1213370880.

The previous prime is 1321437389. The next prime is 1321437431. The reversal of 1321437421 is 1247341231.

It can be written as a sum of positive squares in 4 ways, for example, as 69056100 + 1252381321 = 8310^2 + 35389^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321437421 - 2⁵ = 1321437389 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 1321437421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321437431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 947250 + ... + 948643.

It is an arithmetic number, because the mean of its divisors is an integer number (179161983).

Almost surely, 2^1321437421 is an apocalyptic number.

It is an amenable number.

1321437421 is a deficient number, since it is larger than the sum of its proper divisors (111858443).

1321437421 is a wasteful number, since it uses less digits than its factorization.

1321437421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1895951.

The product of its digits is 4032, while the sum is 28.

The square root of 1321437421 is about 36351.5807221639. The cubic root of 1321437421 is about 1097.3593466524.

Adding to 1321437421 its reverse (1247341231), we get a palindrome (2568778652).

The spelling of 1321437421 in words is "one billion, three hundred twenty-one million, four hundred thirty-seven thousand, four hundred twenty-one".