21210212110 has 32 divisors (see below), whose sum is σ = 39183691680. Its totient is φ = 8263529472.

The previous prime is 21210212083. The next prime is 21210212137. The reversal of 21210212110 is 1121201212.

It is an interprime number because it is at equal distance from previous prime (21210212083) and next prime (21210212137).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118219 + ... + 237478.

It is an arithmetic number, because the mean of its divisors is an integer number (1224490365).

Almost surely, 2^21210212110 is an apocalyptic number.

21210212110 is a deficient number, since it is larger than the sum of its proper divisors (17973479570).

21210212110 is a wasteful number, since it uses less digits than its factorization.

21210212110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355860.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21210212110 its reverse (1121201212), we get a palindrome (22331413322).

The spelling of 21210212110 in words is "twenty-one billion, two hundred ten million, two hundred twelve thousand, one hundred ten".