1321403421 has 16 divisors (see below), whose sum is σ = 2009012544. Its totient is φ = 765337344.

The previous prime is 1321403407. The next prime is 1321403437. The reversal of 1321403421 is 1243041231.

It is not a de Polignac number, because 1321403421 - 2¹⁷ = 1321272349 is a prime.

It is a super-2 number, since 2×1321403421² = 3492214002061006482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321403401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 995871 + ... + 997196.

It is an arithmetic number, because the mean of its divisors is an integer number (125563284).

Almost surely, 2^1321403421 is an apocalyptic number.

It is an amenable number.

1321403421 is a deficient number, since it is larger than the sum of its proper divisors (687609123).

1321403421 is a wasteful number, since it uses less digits than its factorization.

1321403421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1993100.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1321403421 is about 36351.1130641140. The cubic root of 1321403421 is about 1097.3499350482.

Adding to 1321403421 its reverse (1243041231), we get a palindrome (2564444652).

The spelling of 1321403421 in words is "one billion, three hundred twenty-one million, four hundred three thousand, four hundred twenty-one".