20132421 has 16 divisors (see below), whose sum is σ = 27592704. Its totient is φ = 13051584.

The previous prime is 20132407. The next prime is 20132443. The reversal of 20132421 is 12423102.

It is not a de Polignac number, because 20132421 - 2⁵ = 20132389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20132421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20132401) 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 15 ways as a sum of consecutive naturals, for example, 19695 + ... + 20691.

It is an arithmetic number, because the mean of its divisors is an integer number (1724544).

Almost surely, 2^20132421 is an apocalyptic number.

It is an amenable number.

20132421 is a deficient number, since it is larger than the sum of its proper divisors (7460283).

20132421 is a wasteful number, since it uses less digits than its factorization.

20132421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 20132421 is about 4486.9166473203. The cubic root of 20132421 is about 272.0395208218.

Adding to 20132421 its reverse (12423102), we get a palindrome (32555523).

The spelling of 20132421 in words is "twenty million, one hundred thirty-two thousand, four hundred twenty-one".