20021244240223 has 4 divisors (see below), whose sum is σ = 20215625252368. Its totient is φ = 19826863228080.

The previous prime is 20021244240199. The next prime is 20021244240227. The reversal of 20021244240223 is 32204244212002.

It is a happy number.

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 20021244240223 - 2¹⁷ = 20021244109151 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021244240191 and 20021244240200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021244240227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97190505918 + ... + 97190506123.

It is an arithmetic number, because the mean of its divisors is an integer number (5053906313092).

Almost surely, 2^{20021244240223} is an apocalyptic number.

20021244240223 is a deficient number, since it is larger than the sum of its proper divisors (194381012145).

20021244240223 is a wasteful number, since it uses less digits than its factorization.

20021244240223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194381012144.

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 20021244240223 its reverse (32204244212002), we get a palindrome (52225488452225).

The spelling of 20021244240223 in words is "twenty trillion, twenty-one billion, two hundred forty-four million, two hundred forty thousand, two hundred twenty-three".