20120421 has 8 divisors (see below), whose sum is σ = 27032544. Its totient is φ = 13310960.

The previous prime is 20120407. The next prime is 20120437. The reversal of 20120421 is 12402102.

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 20120421 - 2¹³ = 20112229 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20120397 and 20120406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25206 + ... + 25991.

It is an arithmetic number, because the mean of its divisors is an integer number (3379068).

Almost surely, 2^20120421 is an apocalyptic number.

It is an amenable number.

20120421 is a deficient number, since it is larger than the sum of its proper divisors (6912123).

20120421 is a wasteful number, since it uses less digits than its factorization.

20120421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51331.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 20120421 is about 4485.5792268112. The cubic root of 20120421 is about 271.9854600431.

Adding to 20120421 its reverse (12402102), we get a palindrome (32522523).

The spelling of 20120421 in words is "twenty million, one hundred twenty thousand, four hundred twenty-one".