21214233111 has 4 divisors (see below), whose sum is σ = 28285644152. Its totient is φ = 14142822072.

The previous prime is 21214233101. The next prime is 21214233121. The reversal of 21214233111 is 11133241212.

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

It is an interprime number because it is at equal distance from previous prime (21214233101) and next prime (21214233121).

It is not a de Polignac number, because 21214233111 - 2²³ = 21205844503 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 (21214233101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3535705516 + ... + 3535705521.

It is an arithmetic number, because the mean of its divisors is an integer number (7071411038).

Almost surely, 2^21214233111 is an apocalyptic number.

21214233111 is a deficient number, since it is larger than the sum of its proper divisors (7071411041).

21214233111 is an equidigital number, since it uses as much as digits as its factorization.

21214233111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7071411040.

The product of its digits is 288, while the sum is 21.

Adding to 21214233111 its reverse (11133241212), we get a palindrome (32347474323).

The spelling of 21214233111 in words is "twenty-one billion, two hundred fourteen million, two hundred thirty-three thousand, one hundred eleven".