21213522111 has 16 divisors (see below), whose sum is σ = 28719999104. Its totient is φ = 13924890144.

The previous prime is 21213522101. The next prime is 21213522149. The reversal of 21213522111 is 11122531212.

It is not a de Polignac number, because 21213522111 - 2¹¹ = 21213520063 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 (21213522101) 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, 437880 + ... + 483906.

It is an arithmetic number, because the mean of its divisors is an integer number (1794999944).

Almost surely, 2^21213522111 is an apocalyptic number.

21213522111 is a deficient number, since it is larger than the sum of its proper divisors (7506476993).

21213522111 is a wasteful number, since it uses less digits than its factorization.

21213522111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48390.

The product of its digits is 240, while the sum is 21.

The spelling of 21213522111 in words is "twenty-one billion, two hundred thirteen million, five hundred twenty-two thousand, one hundred eleven".