20221442021 has 4 divisors (see below), whose sum is σ = 22059754944. Its totient is φ = 18383129100.

The previous prime is 20221441991. The next prime is 20221442039. The reversal of 20221442021 is 12024412202.

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 20221442021 - 2¹⁸ = 20221179877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20221441984 and 20221442002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221442071) 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, 919156445 + ... + 919156466.

It is an arithmetic number, because the mean of its divisors is an integer number (5514938736).

Almost surely, 2^20221442021 is an apocalyptic number.

It is an amenable number.

20221442021 is a deficient number, since it is larger than the sum of its proper divisors (1838312923).

20221442021 is a wasteful number, since it uses less digits than its factorization.

20221442021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838312922.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 20221442021 its reverse (12024412202), we get a palindrome (32245854223).

The spelling of 20221442021 in words is "twenty billion, two hundred twenty-one million, four hundred forty-two thousand, twenty-one".