20045221123 has 4 divisors (see below), whose sum is σ = 20071913248. Its totient is φ = 20018529000.

The previous prime is 20045221117. The next prime is 20045221127. The reversal of 20045221123 is 32112254002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32112254002 = 2 ⋅16056127001.

It is a cyclic number.

It is not a de Polignac number, because 20045221123 - 2²⁵ = 20011666691 is a prime.

It is a super-2 number, since 2×20045221123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20045221094 and 20045221103.

It is not an unprimeable number, because it can be changed into a prime (20045221127) 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, 13344936 + ... + 13346437.

It is an arithmetic number, because the mean of its divisors is an integer number (5017978312).

Almost surely, 2^20045221123 is an apocalyptic number.

20045221123 is a deficient number, since it is larger than the sum of its proper divisors (26692125).

20045221123 is an equidigital number, since it uses as much as digits as its factorization.

20045221123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26692124.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 20045221123 its reverse (32112254002), we get a palindrome (52157475125).

The spelling of 20045221123 in words is "twenty billion, forty-five million, two hundred twenty-one thousand, one hundred twenty-three".