21220131111 has 8 divisors (see below), whose sum is σ = 29269146480. Its totient is φ = 13658934912.

The previous prime is 21220131091. The next prime is 21220131143. The reversal of 21220131111 is 11113102212.

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

It is not a de Polignac number, because 21220131111 - 2⁶ = 21220131047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220131211) 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, 121954690 + ... + 121954863.

It is an arithmetic number, because the mean of its divisors is an integer number (3658643310).

Almost surely, 2^21220131111 is an apocalyptic number.

21220131111 is a deficient number, since it is larger than the sum of its proper divisors (8049015369).

21220131111 is a wasteful number, since it uses less digits than its factorization.

21220131111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243909585.

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

Adding to 21220131111 its reverse (11113102212), we get a palindrome (32333233323).

The spelling of 21220131111 in words is "twenty-one billion, two hundred twenty million, one hundred thirty-one thousand, one hundred eleven".