21042125321 has 12 divisors (see below), whose sum is σ = 24480313488. Its totient is φ = 18034089192.

The previous prime is 21042125311. The next prime is 21042125327. The reversal of 21042125321 is 12352124012.

It is not a de Polignac number, because 21042125321 - 2¹⁴ = 21042108937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21042125327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 563390 + ... + 599576.

It is an arithmetic number, because the mean of its divisors is an integer number (2040026124).

Almost surely, 2^21042125321 is an apocalyptic number.

It is an amenable number.

21042125321 is a deficient number, since it is larger than the sum of its proper divisors (3438188167).

21042125321 is a wasteful number, since it uses less digits than its factorization.

21042125321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48068 (or 48061 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21042125321 its reverse (12352124012), we get a palindrome (33394249333).

The spelling of 21042125321 in words is "twenty-one billion, forty-two million, one hundred twenty-five thousand, three hundred twenty-one".