2021042042421 has 8 divisors (see below), whose sum is σ = 2738898505824. Its totient is φ = 1325273470320.

The previous prime is 2021042042413. The next prime is 2021042042441. The reversal of 2021042042421 is 1242402401202.

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 2021042042421 - 2³ = 2021042042413 is a prime.

It is a super-2 number, since 2×2021042042421² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2021042042391 and 2021042042400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021042042441) 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, 5521972611 + ... + 5521972976.

It is an arithmetic number, because the mean of its divisors is an integer number (342362313228).

Almost surely, 2^{2021042042421} is an apocalyptic number.

It is an amenable number.

2021042042421 is a deficient number, since it is larger than the sum of its proper divisors (717856463403).

2021042042421 is a wasteful number, since it uses less digits than its factorization.

2021042042421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11043945651.

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 2021042042421 its reverse (1242402401202), we get a palindrome (3263444443623).

The spelling of 2021042042421 in words is "two trillion, twenty-one billion, forty-two million, forty-two thousand, four hundred twenty-one".