20442042221 has 4 divisors (see below), whose sum is σ = 21517939200. Its totient is φ = 19366145244.

The previous prime is 20442042197. The next prime is 20442042253. The reversal of 20442042221 is 12224024402.

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.

It is a cyclic number.

It is not a de Polignac number, because 20442042221 - 2¹⁴ = 20442025837 is a prime.

It is a super-2 number, since 2×20442042221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20442042121) 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, 537948461 + ... + 537948498.

It is an arithmetic number, because the mean of its divisors is an integer number (5379484800).

Almost surely, 2^20442042221 is an apocalyptic number.

It is an amenable number.

20442042221 is a deficient number, since it is larger than the sum of its proper divisors (1075896979).

20442042221 is a wasteful number, since it uses less digits than its factorization.

20442042221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075896978.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 20442042221 its reverse (12224024402), we get a palindrome (32666066623).

The spelling of 20442042221 in words is "twenty billion, four hundred forty-two million, forty-two thousand, two hundred twenty-one".