21101311122013 has 8 divisors (see below), whose sum is σ = 21302408948832. Its totient is φ = 20900285319696.

The previous prime is 21101311121993. The next prime is 21101311122053. The reversal of 21101311122013 is 31022111310112.

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 21101311122013 - 2¹⁷ = 21101310990941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101311122053) 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, 17417295 + ... + 18589372.

It is an arithmetic number, because the mean of its divisors is an integer number (2662801118604).

Almost surely, 2^{21101311122013} is an apocalyptic number.

It is an amenable number.

21101311122013 is a deficient number, since it is larger than the sum of its proper divisors (201097826819).

21101311122013 is a wasteful number, since it uses less digits than its factorization.

21101311122013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36012251.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 21101311122013 its reverse (31022111310112), we get a palindrome (52123422432125).

The spelling of 21101311122013 in words is "twenty-one trillion, one hundred one billion, three hundred eleven million, one hundred twenty-two thousand, thirteen".