21022330331 has 4 divisors (see below), whose sum is σ = 21059277000. Its totient is φ = 20985383664.

The previous prime is 21022330321. The next prime is 21022330361. The reversal of 21022330331 is 13303322012.

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 21022330331 - 2¹⁴ = 21022313947 is a prime.

It is a super-2 number, since 2×21022330331² (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 (21022330321) 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, 18472481 + ... + 18473618.

It is an arithmetic number, because the mean of its divisors is an integer number (5264819250).

Almost surely, 2^21022330331 is an apocalyptic number.

21022330331 is a deficient number, since it is larger than the sum of its proper divisors (36946669).

21022330331 is an equidigital number, since it uses as much as digits as its factorization.

21022330331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36946668.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21022330331 its reverse (13303322012), we get a palindrome (34325652343).

The spelling of 21022330331 in words is "twenty-one billion, twenty-two million, three hundred thirty thousand, three hundred thirty-one".