20211121 has 8 divisors (see below), whose sum is σ = 23154560. Its totient is φ = 17281728.

The previous prime is 20211109. The next prime is 20211127. The reversal of 20211121 is 12111202.

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 20211121 - 2⁹ = 20210609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20211098 and 20211107.

It is not an unprimeable number, because it can be changed into a prime (20211127) 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, 216 + ... + 6361.

It is an arithmetic number, because the mean of its divisors is an integer number (2894320).

Almost surely, 2^20211121 is an apocalyptic number.

It is an amenable number.

20211121 is a deficient number, since it is larger than the sum of its proper divisors (2943439).

20211121 is an equidigital number, since it uses as much as digits as its factorization.

20211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7023.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 20211121 is about 4495.6780356249. The cubic root of 20211121 is about 272.3935380773.

Adding to 20211121 its reverse (12111202), we get a palindrome (32322323).

The spelling of 20211121 in words is "twenty million, two hundred eleven thousand, one hundred twenty-one".