20610121 has 4 divisors (see below), whose sum is σ = 23554432. Its totient is φ = 17665812.

The previous prime is 20610119. The next prime is 20610151. The reversal of 20610121 is 12101602.

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: 12101602 = 2 ⋅6050801.

It is a cyclic number.

It is not a de Polignac number, because 20610121 - 2¹ = 20610119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20610151) 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, 1472145 + ... + 1472158.

It is an arithmetic number, because the mean of its divisors is an integer number (5888608).

Almost surely, 2^20610121 is an apocalyptic number.

It is an amenable number.

20610121 is a deficient number, since it is larger than the sum of its proper divisors (2944311).

20610121 is an equidigital number, since it uses as much as digits as its factorization.

20610121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2944310.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 20610121 is about 4539.8371116153. The cubic root of 20610121 is about 274.1743655458.

Adding to 20610121 its reverse (12101602), we get a palindrome (32711723).

The spelling of 20610121 in words is "twenty million, six hundred ten thousand, one hundred twenty-one".