21111102221013 has 72 divisors (see below), whose sum is σ = 35800030646016. Its totient is φ = 11952556862400.

The previous prime is 21111102220997. The next prime is 21111102221017. The reversal of 21111102221013 is 31012220111112.

It is a happy number.

It is not a de Polignac number, because 21111102221013 - 2⁴ = 21111102220997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111102221017) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 21143520 + ... + 22119462.

Almost surely, 2^{21111102221013} is an apocalyptic number.

It is an amenable number.

21111102221013 is a deficient number, since it is larger than the sum of its proper divisors (14688928425003).

21111102221013 is a wasteful number, since it uses less digits than its factorization.

21111102221013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976415 (or 976405 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 21111102221013 its reverse (31012220111112), we get a palindrome (52123322332125).

The spelling of 21111102221013 in words is "twenty-one trillion, one hundred eleven billion, one hundred two million, two hundred twenty-one thousand, thirteen".