21115441013 has 8 divisors (see below), whose sum is σ = 21211333920. Its totient is φ = 21019642000.

The previous prime is 21115441007. The next prime is 21115441021. The reversal of 21115441013 is 31014451112.

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 21115441013 - 2¹² = 21115436917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21115441013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115441043) 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, 448718 + ... + 493536.

It is an arithmetic number, because the mean of its divisors is an integer number (2651416740).

Almost surely, 2^21115441013 is an apocalyptic number.

It is an amenable number.

21115441013 is a deficient number, since it is larger than the sum of its proper divisors (95892907).

21115441013 is a wasteful number, since it uses less digits than its factorization.

21115441013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46947.

The product of its (nonzero) digits is 480, while the sum is 23.

Adding to 21115441013 its reverse (31014451112), we get a palindrome (52129892125).

The spelling of 21115441013 in words is "twenty-one billion, one hundred fifteen million, four hundred forty-one thousand, thirteen".