21230213111 has 8 divisors (see below), whose sum is σ = 21269174400. Its totient is φ = 21191288320.

The previous prime is 21230213099. The next prime is 21230213129. The reversal of 21230213111 is 11131203212.

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 21230213111 - 2¹⁸ = 21229950967 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21230213111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230213131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1328891 + ... + 1344771.

It is an arithmetic number, because the mean of its divisors is an integer number (2658646800).

Almost surely, 2^21230213111 is an apocalyptic number.

21230213111 is a deficient number, since it is larger than the sum of its proper divisors (38961289).

21230213111 is a wasteful number, since it uses less digits than its factorization.

21230213111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18249.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21230213111 its reverse (11131203212), we get a palindrome (32361416323).

The spelling of 21230213111 in words is "twenty-one billion, two hundred thirty million, two hundred thirteen thousand, one hundred eleven".