20221123 has 4 divisors (see below), whose sum is σ = 21776608. Its totient is φ = 18665640.

The previous prime is 20221099. The next prime is 20221127. The reversal of 20221123 is 32112202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20221123 - 2¹³ = 20212931 is a prime.

It is a super-2 number, since 2×20221123² = 817787630762258, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 1555471 = 20221123 / (2 + 0 + 2 + 2 + 1 + 1 + 2 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20221127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 777723 + ... + 777748.

It is an arithmetic number, because the mean of its divisors is an integer number (5444152).

Almost surely, 2^20221123 is an apocalyptic number.

20221123 is a deficient number, since it is larger than the sum of its proper divisors (1555485).

20221123 is a wasteful number, since it uses less digits than its factorization.

20221123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555484.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20221123 is about 4496.7902997583. The cubic root of 20221123 is about 272.4384643477.

Adding to 20221123 its reverse (32112202), we get a palindrome (52333325).

The spelling of 20221123 in words is "twenty million, two hundred twenty-one thousand, one hundred twenty-three".