33131421 has 12 divisors (see below), whose sum is σ = 50375520. Its totient is φ = 20925000.

The previous prime is 33131393. The next prime is 33131429. The reversal of 33131421 is 12413133.

33131421 is a `hidden beast` number, since 331 + 314 + 21 = 666.

It is not a de Polignac number, because 33131421 - 2¹¹ = 33129373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 33131394 and 33131403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33131429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96705 + ... + 97046.

It is an arithmetic number, because the mean of its divisors is an integer number (4197960).

Almost surely, 2^33131421 is an apocalyptic number.

It is an amenable number.

33131421 is a deficient number, since it is larger than the sum of its proper divisors (17244099).

33131421 is a wasteful number, since it uses less digits than its factorization.

33131421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193776 (or 193773 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 33131421 is about 5755.9900104152. The cubic root of 33131421 is about 321.1786643324.

Adding to 33131421 its reverse (12413133), we get a palindrome (45544554).

The spelling of 33131421 in words is "thirty-three million, one hundred thirty-one thousand, four hundred twenty-one".