21331213111 has 8 divisors (see below), whose sum is σ = 22975115184. Its totient is φ = 19687745280.

The previous prime is 21331213103. The next prime is 21331213157. The reversal of 21331213111 is 11131213312.

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 21331213111 - 2³ = 21331213103 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 (21331213411) 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, 2701 + ... + 206566.

It is an arithmetic number, because the mean of its divisors is an integer number (2871889398).

Almost surely, 2^21331213111 is an apocalyptic number.

21331213111 is a deficient number, since it is larger than the sum of its proper divisors (1643902073).

21331213111 is a wasteful number, since it uses less digits than its factorization.

21331213111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217121.

The product of its digits is 108, while the sum is 19.

Adding to 21331213111 its reverse (11131213312), we get a palindrome (32462426423).

The spelling of 21331213111 in words is "twenty-one billion, three hundred thirty-one million, two hundred thirteen thousand, one hundred eleven".