21013015411 has 16 divisors (see below), whose sum is σ = 22110359040. Its totient is φ = 19947170880.

The previous prime is 21013015399. The next prime is 21013015459. The reversal of 21013015411 is 11451031012.

It is a cyclic number.

It is not a de Polignac number, because 21013015411 - 2⁵ = 21013015379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21013015511) 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, 441010 + ... + 486328.

It is an arithmetic number, because the mean of its divisors is an integer number (1381897440).

Almost surely, 2^21013015411 is an apocalyptic number.

21013015411 is a deficient number, since it is larger than the sum of its proper divisors (1097343629).

21013015411 is a wasteful number, since it uses less digits than its factorization.

21013015411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45666.

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 21013015411 its reverse (11451031012), we get a palindrome (32464046423).

The spelling of 21013015411 in words is "twenty-one billion, thirteen million, fifteen thousand, four hundred eleven".