21110222131 has 4 divisors (see below), whose sum is σ = 21110544664. Its totient is φ = 21109899600.

The previous prime is 21110222129. The next prime is 21110222171. The reversal of 21110222131 is 13122201112.

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 21110222131 - 2¹ = 21110222129 is a prime.

It is a super-2 number, since 2×21110222131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110222101) 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 3 ways as a sum of consecutive naturals, for example, 24330 + ... + 206911.

It is an arithmetic number, because the mean of its divisors is an integer number (5277636166).

Almost surely, 2^21110222131 is an apocalyptic number.

21110222131 is a deficient number, since it is larger than the sum of its proper divisors (322533).

21110222131 is an equidigital number, since it uses as much as digits as its factorization.

21110222131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322532.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21110222131 its reverse (13122201112), we get a palindrome (34232423243).

The spelling of 21110222131 in words is "twenty-one billion, one hundred ten million, two hundred twenty-two thousand, one hundred thirty-one".