21213120111 has 8 divisors (see below), whose sum is σ = 28706312064. Its totient is φ = 13931004120.

The previous prime is 21213120091. The next prime is 21213120119. The reversal of 21213120111 is 11102131212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21213120111 - 2⁵ = 21213120079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213120119) 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, 52768755 + ... + 52769156.

It is an arithmetic number, because the mean of its divisors is an integer number (3588289008).

Almost surely, 2^21213120111 is an apocalyptic number.

21213120111 is a deficient number, since it is larger than the sum of its proper divisors (7493191953).

21213120111 is a wasteful number, since it uses less digits than its factorization.

21213120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105537981.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21213120111 its reverse (11102131212), we get a palindrome (32315251323).

It can be divided in two parts, 212131201 and 11, that added together give a palindrome (212131212).

The spelling of 21213120111 in words is "twenty-one billion, two hundred thirteen million, one hundred twenty thousand, one hundred eleven".