21202010111 has 4 divisors (see below), whose sum is σ = 22317905400. Its totient is φ = 20086114824.

The previous prime is 21202010101. The next prime is 21202010119. The reversal of 21202010111 is 11101020212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21202010111 - 2¹⁴ = 21201993727 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202010092 and 21202010101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202010119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 557947616 + ... + 557947653.

It is an arithmetic number, because the mean of its divisors is an integer number (5579476350).

Almost surely, 2^21202010111 is an apocalyptic number.

21202010111 is a deficient number, since it is larger than the sum of its proper divisors (1115895289).

21202010111 is a wasteful number, since it uses less digits than its factorization.

21202010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115895288.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21202010111 its reverse (11101020212), we get a palindrome (32303030323).

The spelling of 21202010111 in words is "twenty-one billion, two hundred two million, ten thousand, one hundred eleven".