21003220331 has 16 divisors (see below), whose sum is σ = 22428819840. Its totient is φ = 19610061120.

The previous prime is 21003220319. The next prime is 21003220351. The reversal of 21003220331 is 13302230012.

It is not a de Polignac number, because 21003220331 - 2⁶ = 21003220267 is a prime.

It is a super-2 number, since 2×21003220331² (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 (21003220351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2051816 + ... + 2062026.

It is an arithmetic number, because the mean of its divisors is an integer number (1401801240).

Almost surely, 2^21003220331 is an apocalyptic number.

21003220331 is a deficient number, since it is larger than the sum of its proper divisors (1425599509).

21003220331 is a wasteful number, since it uses less digits than its factorization.

21003220331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11786.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21003220331 its reverse (13302230012), we get a palindrome (34305450343).

The spelling of 21003220331 in words is "twenty-one billion, three million, two hundred twenty thousand, three hundred thirty-one".