21221113431011 has 4 divisors (see below), whose sum is σ = 22853506771872. Its totient is φ = 19588720090152.

The previous prime is 21221113430971. The next prime is 21221113431029. The reversal of 21221113431011 is 11013431112212.

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

It is a cyclic number.

It is not a de Polignac number, because 21221113431011 - 2⁶ = 21221113430947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221113461011) 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, 816196670411 + ... + 816196670436.

It is an arithmetic number, because the mean of its divisors is an integer number (5713376692968).

Almost surely, 2^{21221113431011} is an apocalyptic number.

21221113431011 is a deficient number, since it is larger than the sum of its proper divisors (1632393340861).

21221113431011 is a wasteful number, since it uses less digits than its factorization.

21221113431011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632393340860.

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 21221113431011 its reverse (11013431112212), we get a palindrome (32234544543223).

The spelling of 21221113431011 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred thirteen million, four hundred thirty-one thousand, eleven".