20213042444021 has 16 divisors (see below), whose sum is σ = 24973643180160. Its totient is φ = 15969987604800.

The previous prime is 20213042443967. The next prime is 20213042444057. The reversal of 20213042444021 is 12044424031202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20213042444021 - 2³⁰ = 20211968702197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20213042444321) 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, 2053748630 + ... + 2053758471.

It is an arithmetic number, because the mean of its divisors is an integer number (1560852698760).

Almost surely, 2^{20213042444021} is an apocalyptic number.

It is an amenable number.

20213042444021 is a deficient number, since it is larger than the sum of its proper divisors (4760600736139).

20213042444021 is a wasteful number, since it uses less digits than its factorization.

20213042444021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4107507164.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 20213042444021 its reverse (12044424031202), we get a palindrome (32257466475223).

The spelling of 20213042444021 in words is "twenty trillion, two hundred thirteen billion, forty-two million, four hundred forty-four thousand, twenty-one".