21042125211 has 16 divisors (see below), whose sum is σ = 28204596000. Its totient is φ = 13954049280.

The previous prime is 21042125201. The next prime is 21042125213. The reversal of 21042125211 is 11252124012.

It is not a de Polignac number, because 21042125211 - 2⁶ = 21042125147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21042125213) 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 15 ways as a sum of consecutive naturals, for example, 453415 + ... + 497663.

It is an arithmetic number, because the mean of its divisors is an integer number (1762787250).

Almost surely, 2^21042125211 is an apocalyptic number.

21042125211 is a deficient number, since it is larger than the sum of its proper divisors (7162470789).

21042125211 is a wasteful number, since it uses less digits than its factorization.

21042125211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45086.

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 21042125211 its reverse (11252124012), we get a palindrome (32294249223).

The spelling of 21042125211 in words is "twenty-one billion, forty-two million, one hundred twenty-five thousand, two hundred eleven".