20144004021 has 16 divisors (see below), whose sum is σ = 31598438400. Its totient is φ = 12639374784.

The previous prime is 20144004019. The next prime is 20144004037. The reversal of 20144004021 is 12040044102.

20144004021 is a `hidden beast` number, since 201 + 4 + 400 + 40 + 21 = 666.

It is not a de Polignac number, because 20144004021 - 2¹ = 20144004019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20144003985 and 20144004003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20144004071) 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, 21942901 + ... + 21943818.

It is an arithmetic number, because the mean of its divisors is an integer number (1974902400).

Almost surely, 2^20144004021 is an apocalyptic number.

It is an amenable number.

20144004021 is a deficient number, since it is larger than the sum of its proper divisors (11454434379).

20144004021 is a wasteful number, since it uses less digits than its factorization.

20144004021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43886745 (or 43886739 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 20144004021 its reverse (12040044102), we get a palindrome (32184048123).

The spelling of 20144004021 in words is "twenty billion, one hundred forty-four million, four thousand, twenty-one".