20322121 has 4 divisors (see below), whose sum is σ = 20340244. Its totient is φ = 20304000.

The previous prime is 20322119. The next prime is 20322131. The reversal of 20322121 is 12122302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5112121 + 15210000 = 2261^2 + 3900^2 .

It is a cyclic number.

It is not a de Polignac number, because 20322121 - 2¹ = 20322119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20322131) 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, 7260 + ... + 9661.

It is an arithmetic number, because the mean of its divisors is an integer number (5085061).

Almost surely, 2^20322121 is an apocalyptic number.

It is an amenable number.

20322121 is a deficient number, since it is larger than the sum of its proper divisors (18123).

20322121 is a wasteful number, since it uses less digits than its factorization.

20322121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18122.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20322121 is about 4508.0063220896. The cubic root of 20322121 is about 272.8912920824.

Adding to 20322121 its reverse (12122302), we get a palindrome (32444423).

The spelling of 20322121 in words is "twenty million, three hundred twenty-two thousand, one hundred twenty-one".