2120113521421 has 4 divisors (see below), whose sum is σ = 2422986881632. Its totient is φ = 1817240161212.

The previous prime is 2120113521329. The next prime is 2120113521511. The reversal of 2120113521421 is 1241253110212.

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 not a de Polignac number, because 2120113521421 - 2³³ = 2111523586829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120113527421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151436680095 + ... + 151436680108.

It is an arithmetic number, because the mean of its divisors is an integer number (605746720408).

Almost surely, 2^{2120113521421} is an apocalyptic number.

It is an amenable number.

2120113521421 is a deficient number, since it is larger than the sum of its proper divisors (302873360211).

2120113521421 is an equidigital number, since it uses as much as digits as its factorization.

2120113521421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302873360210.

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 2120113521421 its reverse (1241253110212), we get a palindrome (3361366631633).

The spelling of 2120113521421 in words is "two trillion, one hundred twenty billion, one hundred thirteen million, five hundred twenty-one thousand, four hundred twenty-one".