20133121 has 4 divisors (see below), whose sum is σ = 20217600. Its totient is φ = 20048644.

The previous prime is 20133107. The next prime is 20133131. The reversal of 20133121 is 12133102.

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 an emirpimes, since its reverse is a distinct semiprime: 12133102 = 2 ⋅6066551.

It is a cyclic number.

It is not a de Polignac number, because 20133121 - 2⁵ = 20133089 is a prime.

It is a super-2 number, since 2×20133121² = 810685122401282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20133131) 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, 41881 + ... + 42358.

It is an arithmetic number, because the mean of its divisors is an integer number (5054400).

Almost surely, 2^20133121 is an apocalyptic number.

It is an amenable number.

20133121 is a deficient number, since it is larger than the sum of its proper divisors (84479).

20133121 is an equidigital number, since it uses as much as digits as its factorization.

20133121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84478.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 20133121 is about 4486.9946512114. The cubic root of 20133121 is about 272.0426737040.

Adding to 20133121 its reverse (12133102), we get a palindrome (32266223).

The spelling of 20133121 in words is "twenty million, one hundred thirty-three thousand, one hundred twenty-one".