20133421 has 16 divisors (see below), whose sum is σ = 25204608. Its totient is φ = 15624000.

The previous prime is 20133413. The next prime is 20133431. The reversal of 20133421 is 12433102.

It is a happy number.

It is not a de Polignac number, because 20133421 - 2³ = 20133413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20133395 and 20133404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20133401) 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, 28371 + ... + 29071.

It is an arithmetic number, because the mean of its divisors is an integer number (1575288).

Almost surely, 2^20133421 is an apocalyptic number.

It is an amenable number.

20133421 is a deficient number, since it is larger than the sum of its proper divisors (5071187).

20133421 is a wasteful number, since it uses less digits than its factorization.

20133421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20133421 is about 4487.0280810354. The cubic root of 20133421 is about 272.0440249169.

Adding to 20133421 its reverse (12433102), we get a palindrome (32566523).

The spelling of 20133421 in words is "twenty million, one hundred thirty-three thousand, four hundred twenty-one".