21013251041 has 8 divisors (see below), whose sum is σ = 21062543040. Its totient is φ = 20963989872.

The previous prime is 21013251037. The next prime is 21013251089. The reversal of 21013251041 is 14015231012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21013251041 - 2² = 21013251037 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21013251031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1875131 + ... + 1886303.

It is an arithmetic number, because the mean of its divisors is an integer number (2632817880).

Almost surely, 2^21013251041 is an apocalyptic number.

It is an amenable number.

21013251041 is a deficient number, since it is larger than the sum of its proper divisors (49291999).

21013251041 is a wasteful number, since it uses less digits than its factorization.

21013251041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15415.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 21013251041 its reverse (14015231012), we get a palindrome (35028482053).

The spelling of 21013251041 in words is "twenty-one billion, thirteen million, two hundred fifty-one thousand, forty-one".