21221324030 has 16 divisors (see below), whose sum is σ = 38217528000. Its totient is φ = 8484275232.

The previous prime is 21221324021. The next prime is 21221324041. The reversal of 21221324030 is 3042312212.

It is a junction number, because it is equal to n+sod(n) for n = 21221323993 and 21221324011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 510809 + ... + 550788.

It is an arithmetic number, because the mean of its divisors is an integer number (2388595500).

Almost surely, 2^21221324030 is an apocalyptic number.

21221324030 is a deficient number, since it is larger than the sum of its proper divisors (16996203970).

21221324030 is a wasteful number, since it uses less digits than its factorization.

21221324030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063603.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21221324030 its reverse (3042312212), we get a palindrome (24263636242).

The spelling of 21221324030 in words is "twenty-one billion, two hundred twenty-one million, three hundred twenty-four thousand, thirty".