21103522331 has 4 divisors (see below), whose sum is σ = 21392611752. Its totient is φ = 20814432912.

The previous prime is 21103522303. The next prime is 21103522387. The reversal of 21103522331 is 13322530112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21103522331 is a prime.

It is a super-2 number, since 2×21103522331² (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 = 21103522297 and 21103522306.

It is not an unprimeable number, because it can be changed into a prime (21103522031) 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 3 ways as a sum of consecutive naturals, for example, 144544601 + ... + 144544746.

It is an arithmetic number, because the mean of its divisors is an integer number (5348152938).

Almost surely, 2^21103522331 is an apocalyptic number.

21103522331 is a deficient number, since it is larger than the sum of its proper divisors (289089421).

21103522331 is an equidigital number, since it uses as much as digits as its factorization.

21103522331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289089420.

The product of its (nonzero) digits is 1080, while the sum is 23.

The spelling of 21103522331 in words is "twenty-one billion, one hundred three million, five hundred twenty-two thousand, three hundred thirty-one".