20004443311021 has 16 divisors (see below), whose sum is σ = 22518869716224. Its totient is φ = 17632174500864.

The previous prime is 20004443311009. The next prime is 20004443311081. The reversal of 20004443311021 is 12011334440002.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20004443311021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004443311081) 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, 57803641 + ... + 58148686.

It is an arithmetic number, because the mean of its divisors is an integer number (1407429357264).

Almost surely, 2^{20004443311021} is an apocalyptic number.

It is an amenable number.

20004443311021 is a deficient number, since it is larger than the sum of its proper divisors (2514426405203).

20004443311021 is a wasteful number, since it uses less digits than its factorization.

20004443311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115952940.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 20004443311021 its reverse (12011334440002), we get a palindrome (32015777751023).

The spelling of 20004443311021 in words is "twenty trillion, four billion, four hundred forty-three million, three hundred eleven thousand, twenty-one".