20421444042 has 24 divisors (see below), whose sum is σ = 44345024100. Its totient is φ = 6791984640.

The previous prime is 20421444037. The next prime is 20421444049. The reversal of 20421444042 is 24044412402.

20421444042 is a `hidden beast` number, since 2 + 0 + 4 + 214 + 440 + 4 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19608680961 + 812763081 = 140031^2 + 28509^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20421443997 and 20421444015.

It is not an unprimeable number, because it can be changed into a prime (20421444049) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1255309 + ... + 1271472.

Almost surely, 2^20421444042 is an apocalyptic number.

20421444042 is an abundant number, since it is smaller than the sum of its proper divisors (23923580058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20421444042 is a wasteful number, since it uses less digits than its factorization.

20421444042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2527238 (or 2527235 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 27.

Adding to 20421444042 its reverse (24044412402), we get a palindrome (44465856444).

The spelling of 20421444042 in words is "twenty billion, four hundred twenty-one million, four hundred forty-four thousand, forty-two".