21101101013 has 4 divisors (see below), whose sum is σ = 21101395488. Its totient is φ = 21100806540.

The previous prime is 21101101009. The next prime is 21101101027. The reversal of 21101101013 is 31010110112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21101101013 - 2² = 21101101009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101100985 and 21101101003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101101613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37568 + ... + 208838.

It is an arithmetic number, because the mean of its divisors is an integer number (5275348872).

Almost surely, 2^21101101013 is an apocalyptic number.

It is an amenable number.

21101101013 is a deficient number, since it is larger than the sum of its proper divisors (294475).

21101101013 is a wasteful number, since it uses less digits than its factorization.

21101101013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294474.

The product of its (nonzero) digits is 6, while the sum is 11.

Adding to 21101101013 its reverse (31010110112), we get a palindrome (52111211125).

Subtracting 21101101013 from its reverse (31010110112), we obtain a palindrome (9909009099).

The spelling of 21101101013 in words is "twenty-one billion, one hundred one million, one hundred one thousand, thirteen".