21012215710 has 32 divisors (see below), whose sum is σ = 41096908800. Its totient is φ = 7705666080.

The previous prime is 21012215687. The next prime is 21012215711. The reversal of 21012215710 is 1751221012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012215711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1777830 + ... + 1789609.

It is an arithmetic number, because the mean of its divisors is an integer number (1284278400).

Almost surely, 2^21012215710 is an apocalyptic number.

21012215710 is a deficient number, since it is larger than the sum of its proper divisors (20084693090).

21012215710 is a wasteful number, since it uses less digits than its factorization.

21012215710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3567496.

The product of its (nonzero) digits is 280, while the sum is 22.

Adding to 21012215710 its reverse (1751221012), we get a palindrome (22763436722).

The spelling of 21012215710 in words is "twenty-one billion, twelve million, two hundred fifteen thousand, seven hundred ten".