2021112120021 has 4 divisors (see below), whose sum is σ = 2694816160032. Its totient is φ = 1347408080012.

The previous prime is 2021112119987. The next prime is 2021112120037. The reversal of 2021112120021 is 1200212111202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2021112120021 - 2¹⁹ = 2021111595733 is a prime.

It is a super-2 number, since 2×2021112120021² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021112120061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336852020001 + ... + 336852020006.

It is an arithmetic number, because the mean of its divisors is an integer number (673704040008).

Almost surely, 2^{2021112120021} is an apocalyptic number.

It is an amenable number.

2021112120021 is a deficient number, since it is larger than the sum of its proper divisors (673704040011).

2021112120021 is an equidigital number, since it uses as much as digits as its factorization.

2021112120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673704040010.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2021112120021 its reverse (1200212111202), we get a palindrome (3221324231223).

The spelling of 2021112120021 in words is "two trillion, twenty-one billion, one hundred twelve million, one hundred twenty thousand, twenty-one".