2021121431420 has 192 divisors, whose sum is σ = 5588908953600. Its totient is φ = 596050928640.

The previous prime is 2021121431419. The next prime is 2021121431501. The reversal of 2021121431420 is 241341211202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1630301 + ... + 2588459.

It is an arithmetic number, because the mean of its divisors is an integer number (29108900800).

Almost surely, 2^{2021121431420} is an apocalyptic number.

2021121431420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021121431420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2794454476800).

2021121431420 is an abundant number, since it is smaller than the sum of its proper divisors (3567787522180).

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

2021121431420 is a wasteful number, since it uses less digits than its factorization.

2021121431420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958268 (or 958266 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 2021121431420 its reverse (241341211202), we get a palindrome (2262462642622).

The spelling of 2021121431420 in words is "two trillion, twenty-one billion, one hundred twenty-one million, four hundred thirty-one thousand, four hundred twenty".