321131421 has 12 divisors (see below), whose sum is σ = 499537948. Its totient is φ = 197619264.

The previous prime is 321131417. The next prime is 321131429. The reversal of 321131421 is 124131123.

321131421 is a `hidden beast` number, since 3 + 211 + 31 + 421 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 121220100 + 199911321 = 11010^2 + 14139^2 .

It is not a de Polignac number, because 321131421 - 2² = 321131417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 321131394 and 321131403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321131429) 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 11 ways as a sum of consecutive naturals, for example, 1372240 + ... + 1372473.

Almost surely, 2^321131421 is an apocalyptic number.

It is an amenable number.

321131421 is a deficient number, since it is larger than the sum of its proper divisors (178406527).

321131421 is a wasteful number, since it uses less digits than its factorization.

321131421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2744732 (or 2744729 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 321131421 is about 17920.1400943185. The cubic root of 321131421 is about 684.7955565848.

Adding to 321131421 its reverse (124131123), we get a palindrome (445262544).

The spelling of 321131421 in words is "three hundred twenty-one million, one hundred thirty-one thousand, four hundred twenty-one".