21331030 has 16 divisors (see below), whose sum is σ = 43881120. Its totient is φ = 7313472.

The previous prime is 21331021. The next prime is 21331043. The reversal of 21331030 is 3013312.

It is a self number, because there is not a number n which added to its sum of digits gives 21331030.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 152295 + ... + 152434.

It is an arithmetic number, because the mean of its divisors is an integer number (2742570).

Almost surely, 2^21331030 is an apocalyptic number.

21331030 is an abundant number, since it is smaller than the sum of its proper divisors (22550090).

21331030 is a wasteful number, since it uses less digits than its factorization.

21331030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304743.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 21331030 is about 4618.5528036388. The cubic root of 21331030 is about 277.3345278677.

Adding to 21331030 its reverse (3013312), we get a palindrome (24344342).

The spelling of 21331030 in words is "twenty-one million, three hundred thirty-one thousand, thirty".