20443121301421 has 16 divisors (see below), whose sum is σ = 25160898007168. Its totient is φ = 16174691582400.

The previous prime is 20443121301401. The next prime is 20443121301451. The reversal of 20443121301421 is 12410312134402.

It is a happy number.

It is not a de Polignac number, because 20443121301421 - 2¹⁵ = 20443121268653 is a prime.

It is a super-2 number, since 2×20443121301421² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20443121301421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20443121301401) 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, 20922931 + ... + 21878191.

It is an arithmetic number, because the mean of its divisors is an integer number (1572556125448).

Almost surely, 2^{20443121301421} is an apocalyptic number.

It is an amenable number.

20443121301421 is a deficient number, since it is larger than the sum of its proper divisors (4717776705747).

20443121301421 is a wasteful number, since it uses less digits than its factorization.

20443121301421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190452.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 20443121301421 its reverse (12410312134402), we get a palindrome (32853433435823).

The spelling of 20443121301421 in words is "twenty trillion, four hundred forty-three billion, one hundred twenty-one million, three hundred one thousand, four hundred twenty-one".