20332121 has 4 divisors (see below), whose sum is σ = 20341200. Its totient is φ = 20323044.

The previous prime is 20332099. The next prime is 20332133. The reversal of 20332121 is 12123302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20332121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20332096 and 20332105.

It is not an unprimeable number, because it can be changed into a prime (20332181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1490 + ... + 6548.

It is an arithmetic number, because the mean of its divisors is an integer number (5085300).

Almost surely, 2^20332121 is an apocalyptic number.

It is an amenable number.

20332121 is a deficient number, since it is larger than the sum of its proper divisors (9079).

20332121 is an equidigital number, since it uses as much as digits as its factorization.

20332121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9078.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 20332121 is about 4509.1153234310. The cubic root of 20332121 is about 272.9360457022.

Adding to 20332121 its reverse (12123302), we get a palindrome (32455423).

The spelling of 20332121 in words is "twenty million, three hundred thirty-two thousand, one hundred twenty-one".