20131121 has 8 divisors (see below), whose sum is σ = 20863488. Its totient is φ = 19404000.

The previous prime is 20131117. The next prime is 20131129. The reversal of 20131121 is 12113102.

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

It is a cyclic number.

It is not a de Polignac number, because 20131121 - 2² = 20131117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20131129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7556 + ... + 9866.

It is an arithmetic number, because the mean of its divisors is an integer number (2607936).

Almost surely, 2^20131121 is an apocalyptic number.

It is an amenable number.

20131121 is a deficient number, since it is larger than the sum of its proper divisors (732367).

20131121 is a wasteful number, since it uses less digits than its factorization.

20131121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2623.

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

The square root of 20131121 is about 4486.7717793532. The cubic root of 20131121 is about 272.0336652751.

Adding to 20131121 its reverse (12113102), we get a palindrome (32244223).

The spelling of 20131121 in words is "twenty million, one hundred thirty-one thousand, one hundred twenty-one".