21310111210 has 32 divisors (see below), whose sum is σ = 40035198672. Its totient is φ = 8159224320.

The previous prime is 21310111189. The next prime is 21310111217. The reversal of 21310111210 is 1211101312.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 6345237649 + 14964873561 = 79657^2 + 122331^2 .

It is not an unprimeable number, because it can be changed into a prime (21310111217) 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, 468609 + ... + 512068.

Almost surely, 2^21310111210 is an apocalyptic number.

21310111210 is a deficient number, since it is larger than the sum of its proper divisors (18725087462).

21310111210 is a wasteful number, since it uses less digits than its factorization.

21310111210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980778.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21310111210 its reverse (1211101312), we get a palindrome (22521212522).

The spelling of 21310111210 in words is "twenty-one billion, three hundred ten million, one hundred eleven thousand, two hundred ten".