21110211331 has 4 divisors (see below), whose sum is σ = 23029321464. Its totient is φ = 19191101200.

The previous prime is 21110211313. The next prime is 21110211347. The reversal of 21110211331 is 13311201112.

It is a happy number.

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 21110211331 - 2¹⁹ = 21109687043 is a prime.

It is a super-2 number, since 2×21110211331² (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 (21110281331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 959555050 + ... + 959555071.

It is an arithmetic number, because the mean of its divisors is an integer number (5757330366).

Almost surely, 2^21110211331 is an apocalyptic number.

21110211331 is a deficient number, since it is larger than the sum of its proper divisors (1919110133).

21110211331 is a wasteful number, since it uses less digits than its factorization.

21110211331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919110132.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21110211331 its reverse (13311201112), we get a palindrome (34421412443).

The spelling of 21110211331 in words is "twenty-one billion, one hundred ten million, two hundred eleven thousand, three hundred thirty-one".