20121133 has 4 divisors (see below), whose sum is σ = 21180160. Its totient is φ = 19062108.

The previous prime is 20121121. The next prime is 20121137. The reversal of 20121133 is 33112102.

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: 33112102 = 2 ⋅16556051.

It is a cyclic number.

It is not a de Polignac number, because 20121133 - 2²¹ = 18023981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121137) 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 3 ways as a sum of consecutive naturals, for example, 529485 + ... + 529522.

It is an arithmetic number, because the mean of its divisors is an integer number (5295040).

Almost surely, 2^20121133 is an apocalyptic number.

It is an amenable number.

20121133 is a deficient number, since it is larger than the sum of its proper divisors (1059027).

20121133 is a wasteful number, since it uses less digits than its factorization.

20121133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059026.

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

The square root of 20121133 is about 4485.6585915560. The cubic root of 20121133 is about 271.9886682491.

Adding to 20121133 its reverse (33112102), we get a palindrome (53233235).

The spelling of 20121133 in words is "twenty million, one hundred twenty-one thousand, one hundred thirty-three".