21112223331 has 16 divisors (see below), whose sum is σ = 29645383040. Its totient is φ = 13327649280.

The previous prime is 21112223323. The next prime is 21112223437. The reversal of 21112223331 is 13332221112.

It is not a de Polignac number, because 21112223331 - 2³ = 21112223323 is a prime.

It is a super-2 number, since 2×21112223331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21112223298 and 21112223307.

It is not an unprimeable number, because it can be changed into a prime (21112223311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32796 + ... + 208086.

It is an arithmetic number, because the mean of its divisors is an integer number (1852836440).

Almost surely, 2^21112223331 is an apocalyptic number.

21112223331 is a deficient number, since it is larger than the sum of its proper divisors (8533159709).

21112223331 is a wasteful number, since it uses less digits than its factorization.

21112223331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177426.

The product of its digits is 432, while the sum is 21.

Adding to 21112223331 its reverse (13332221112), we get a palindrome (34444444443).

The spelling of 21112223331 in words is "twenty-one billion, one hundred twelve million, two hundred twenty-three thousand, three hundred thirty-one".