21332551112111 has 4 divisors (see below), whose sum is σ = 21402038249592. Its totient is φ = 21263063974632.

The previous prime is 21332551112101. The next prime is 21332551112113. The reversal of 21332551112111 is 11121115523312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21332551112111 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 (21332551112113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34743568280 + ... + 34743568893.

It is an arithmetic number, because the mean of its divisors is an integer number (5350509562398).

Almost surely, 2^{21332551112111} is an apocalyptic number.

21332551112111 is a deficient number, since it is larger than the sum of its proper divisors (69487137481).

21332551112111 is an equidigital number, since it uses as much as digits as its factorization.

21332551112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69487137480.

The product of its digits is 1800, while the sum is 29.

Adding to 21332551112111 its reverse (11121115523312), we get a palindrome (32453666635423).

The spelling of 21332551112111 in words is "twenty-one trillion, three hundred thirty-two billion, five hundred fifty-one million, one hundred twelve thousand, one hundred eleven".