21013111101 has 16 divisors (see below), whose sum is σ = 28608632064. Its totient is φ = 13715967744.

The previous prime is 21013111087. The next prime is 21013111111. The reversal of 21013111101 is 10111131012.

It is not a de Polignac number, because 21013111101 - 2⁹ = 21013110589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013111111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320181 + ... + 380186.

It is an arithmetic number, because the mean of its divisors is an integer number (1788039504).

Almost surely, 2^21013111101 is an apocalyptic number.

It is an amenable number.

21013111101 is a deficient number, since it is larger than the sum of its proper divisors (7595520963).

21013111101 is a wasteful number, since it uses less digits than its factorization.

21013111101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700580.

The product of its (nonzero) digits is 6, while the sum is 12.

Adding to 21013111101 its reverse (10111131012), we get a palindrome (31124242113).

The spelling of 21013111101 in words is "twenty-one billion, thirteen million, one hundred eleven thousand, one hundred one".