20442234021 has 16 divisors (see below), whose sum is σ = 29788543488. Its totient is φ = 12366572400.

The previous prime is 20442234017. The next prime is 20442234031. The reversal of 20442234021 is 12043224402.

It is not a de Polignac number, because 20442234021 - 2² = 20442234017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20442233982 and 20442234000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20442234011) 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, 548185 + ... + 584286.

It is an arithmetic number, because the mean of its divisors is an integer number (1861783968).

Almost surely, 2^20442234021 is an apocalyptic number.

It is an amenable number.

20442234021 is a deficient number, since it is larger than the sum of its proper divisors (9346309467).

20442234021 is a wasteful number, since it uses less digits than its factorization.

20442234021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133032.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 20442234021 its reverse (12043224402), we get a palindrome (32485458423).

The spelling of 20442234021 in words is "twenty billion, four hundred forty-two million, two hundred thirty-four thousand, twenty-one".