2021131202421 has 8 divisors (see below), whose sum is σ = 2767675160224. Its totient is φ = 1311004023120.

The previous prime is 2021131202381. The next prime is 2021131202423. The reversal of 2021131202421 is 1242021311202.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2021131202421 - 2¹⁵ = 2021131169653 is a prime.

It is a super-2 number, since 2×2021131202421² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021131202423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9104194495 + ... + 9104194716.

It is an arithmetic number, because the mean of its divisors is an integer number (345959395028).

Almost surely, 2^{2021131202421} is an apocalyptic number.

It is an amenable number.

2021131202421 is a deficient number, since it is larger than the sum of its proper divisors (746543957803).

2021131202421 is a wasteful number, since it uses less digits than its factorization.

2021131202421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18208389251.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 2021131202421 its reverse (1242021311202), we get a palindrome (3263152513623).

The spelling of 2021131202421 in words is "two trillion, twenty-one billion, one hundred thirty-one million, two hundred two thousand, four hundred twenty-one".