21231201332111 has 4 divisors (see below), whose sum is σ = 21232995883824. Its totient is φ = 21229406780400.

The previous prime is 21231201332059. The next prime is 21231201332123. The reversal of 21231201332111 is 11123310213212.

It is a happy number.

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-21231201332111 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 (21231201332141) 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, 897258110 + ... + 897281771.

It is an arithmetic number, because the mean of its divisors is an integer number (5308248970956).

Almost surely, 2^{21231201332111} is an apocalyptic number.

21231201332111 is a deficient number, since it is larger than the sum of its proper divisors (1794551713).

21231201332111 is a wasteful number, since it uses less digits than its factorization.

21231201332111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1794551712.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21231201332111 its reverse (11123310213212), we get a palindrome (32354511545323).

The spelling of 21231201332111 in words is "twenty-one trillion, two hundred thirty-one billion, two hundred one million, three hundred thirty-two thousand, one hundred eleven".