20423140221 has 16 divisors (see below), whose sum is σ = 30209886720. Its totient is φ = 12167868720.

The previous prime is 20423140219. The next prime is 20423140267. The reversal of 20423140221 is 12204132402.

It is not a de Polignac number, because 20423140221 - 2¹ = 20423140219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423140201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5242825 + ... + 5246718.

It is an arithmetic number, because the mean of its divisors is an integer number (1888117920).

Almost surely, 2^20423140221 is an apocalyptic number.

It is an amenable number.

20423140221 is a deficient number, since it is larger than the sum of its proper divisors (9786746499).

20423140221 is a wasteful number, since it uses less digits than its factorization.

20423140221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10489616.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 20423140221 its reverse (12204132402), we get a palindrome (32627272623).

The spelling of 20423140221 in words is "twenty billion, four hundred twenty-three million, one hundred forty thousand, two hundred twenty-one".