21015211041 has 36 divisors (see below), whose sum is σ = 34949556720. Its totient is φ = 12066129360.

The previous prime is 21015211039. The next prime is 21015211057. The reversal of 21015211041 is 14011251012.

21015211041 is a `hidden beast` number, since 2 + 101 + 521 + 1 + 0 + 41 = 666.

It is not a de Polignac number, because 21015211041 - 2¹ = 21015211039 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21015211141) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 258271 + ... + 329748.

It is an arithmetic number, because the mean of its divisors is an integer number (970821020).

Almost surely, 2^21015211041 is an apocalyptic number.

It is an amenable number.

21015211041 is a deficient number, since it is larger than the sum of its proper divisors (13934345679).

21015211041 is a wasteful number, since it uses less digits than its factorization.

21015211041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588074 (or 588052 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

Adding to 21015211041 its reverse (14011251012), we get a palindrome (35026462053).

It can be divided in two parts, 210 and 15211041, that added together give a palindrome (15211251).

The spelling of 21015211041 in words is "twenty-one billion, fifteen million, two hundred eleven thousand, forty-one".