20113121 has 8 divisors (see below), whose sum is σ = 23521344. Its totient is φ = 16838640.

The previous prime is 20113099. The next prime is 20113123. The reversal of 20113121 is 12131102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20113121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20113123) 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 7 ways as a sum of consecutive naturals, for example, 33110 + ... + 33711.

It is an arithmetic number, because the mean of its divisors is an integer number (2940168).

Almost surely, 2^20113121 is an apocalyptic number.

It is an amenable number.

20113121 is a deficient number, since it is larger than the sum of its proper divisors (3408223).

20113121 is an equidigital number, since it uses as much as digits as its factorization.

20113121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66871.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 20113121 is about 4484.7654342228. The cubic root of 20113121 is about 271.9525625534.

Adding to 20113121 its reverse (12131102), we get a palindrome (32244223).

The spelling of 20113121 in words is "twenty million, one hundred thirteen thousand, one hundred twenty-one".