21030221331 has 48 divisors (see below), whose sum is σ = 36796032000. Its totient is φ = 11298887424.

The previous prime is 21030221309. The next prime is 21030221341. The reversal of 21030221331 is 13312203012.

21030221331 is a `hidden beast` number, since 2 + 10 + 302 + 21 + 331 = 666.

It is not a de Polignac number, because 21030221331 - 2⁷ = 21030221203 is a prime.

It is a super-2 number, since 2×21030221331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21030221341) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1103320 + ... + 1122218.

It is an arithmetic number, because the mean of its divisors is an integer number (766584000).

Almost surely, 2^21030221331 is an apocalyptic number.

21030221331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21030221331 is a deficient number, since it is larger than the sum of its proper divisors (15765810669).

21030221331 is a wasteful number, since it uses less digits than its factorization.

21030221331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19968 (or 19965 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21030221331 its reverse (13312203012), we get a palindrome (34342424343).

The spelling of 21030221331 in words is "twenty-one billion, thirty million, two hundred twenty-one thousand, three hundred thirty-one".