21152221010 has 48 divisors (see below), whose sum is σ = 41479817472. Its totient is φ = 7756970400.

The previous prime is 21152221003. The next prime is 21152221037. The reversal of 21152221010 is 1012225112.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21152221010.

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 23 ways as a sum of consecutive naturals, for example, 17405 + ... + 206415.

It is an arithmetic number, because the mean of its divisors is an integer number (864162864).

Almost surely, 2^21152221010 is an apocalyptic number.

21152221010 is a deficient number, since it is larger than the sum of its proper divisors (20327596462).

21152221010 is a wasteful number, since it uses less digits than its factorization.

21152221010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189087 (or 189068 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 21152221010 its reverse (1012225112), we get a palindrome (22164446122).

The spelling of 21152221010 in words is "twenty-one billion, one hundred fifty-two million, two hundred twenty-one thousand, ten".