20121151 has 4 divisors (see below), whose sum is σ = 20172232. Its totient is φ = 20070072.

The previous prime is 20121137. The next prime is 20121169. The reversal of 20121151 is 15112102.

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

It is a cyclic number.

It is not a de Polignac number, because 20121151 - 2¹³ = 20112959 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 (20121121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24945 + ... + 25738.

It is an arithmetic number, because the mean of its divisors is an integer number (5043058).

Almost surely, 2^20121151 is an apocalyptic number.

20121151 is a deficient number, since it is larger than the sum of its proper divisors (51081).

20121151 is an equidigital number, since it uses as much as digits as its factorization.

20121151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51080.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 20121151 is about 4485.6605979499. The cubic root of 20121151 is about 271.9887493544.

Adding to 20121151 its reverse (15112102), we get a palindrome (35233253).

The spelling of 20121151 in words is "twenty million, one hundred twenty-one thousand, one hundred fifty-one".