21221303010 has 32 divisors (see below), whose sum is σ = 52307646912. Its totient is φ = 5506067520.

The previous prime is 21221303003. The next prime is 21221303021. The reversal of 21221303010 is 1030312212.

21221303010 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9558036 + ... + 9560255.

It is an arithmetic number, because the mean of its divisors is an integer number (1634613966).

Almost surely, 2^21221303010 is an apocalyptic number.

21221303010 is an abundant number, since it is smaller than the sum of its proper divisors (31086343902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221303010 is a wasteful number, since it uses less digits than its factorization.

21221303010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19118338.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21221303010 its reverse (1030312212), we get a palindrome (22251615222).

The spelling of 21221303010 in words is "twenty-one billion, two hundred twenty-one million, three hundred three thousand, ten".