21220111131 has 8 divisors (see below), whose sum is σ = 28327614480. Its totient is φ = 14129674272.

The previous prime is 21220111109. The next prime is 21220111139. The reversal of 21220111131 is 13111102212.

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

It is not a de Polignac number, because 21220111131 - 2⁶ = 21220111067 is a prime.

It is a super-2 number, since 2×21220111131² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21220111131.

It is not an unprimeable number, because it can be changed into a prime (21220111139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4263720 + ... + 4268693.

It is an arithmetic number, because the mean of its divisors is an integer number (3540951810).

Almost surely, 2^21220111131 is an apocalyptic number.

21220111131 is a deficient number, since it is larger than the sum of its proper divisors (7107503349).

21220111131 is an equidigital number, since it uses as much as digits as its factorization.

21220111131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8533245.

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

Adding to 21220111131 its reverse (13111102212), we get a palindrome (34331213343).

The spelling of 21220111131 in words is "twenty-one billion, two hundred twenty million, one hundred eleven thousand, one hundred thirty-one".