20611121 has 4 divisors (see below), whose sum is σ = 20697600. Its totient is φ = 20524644.

The previous prime is 20611111. The next prime is 20611127. The reversal of 20611121 is 12111602.

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: 12111602 = 2 ⋅6055801.

It is a cyclic number.

It is not a de Polignac number, because 20611121 - 2⁶ = 20611057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20611096 and 20611105.

It is not an unprimeable number, because it can be changed into a prime (20611127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42881 + ... + 43358.

It is an arithmetic number, because the mean of its divisors is an integer number (5174400).

Almost surely, 2^20611121 is an apocalyptic number.

It is an amenable number.

20611121 is a deficient number, since it is larger than the sum of its proper divisors (86479).

20611121 is an equidigital number, since it uses as much as digits as its factorization.

20611121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86478.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 20611121 is about 4539.9472463895. The cubic root of 20611121 is about 274.1787997739.

Adding to 20611121 its reverse (12111602), we get a palindrome (32722723).

The spelling of 20611121 in words is "twenty million, six hundred eleven thousand, one hundred twenty-one".