21212200110 has 64 divisors (see below), whose sum is σ = 53154247680. Its totient is φ = 5407438080.

The previous prime is 21212200043. The next prime is 21212200147. The reversal of 21212200110 is 1100221212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1288330 + ... + 1304690.

It is an arithmetic number, because the mean of its divisors is an integer number (830535120).

Almost surely, 2^21212200110 is an apocalyptic number.

21212200110 is an abundant number, since it is smaller than the sum of its proper divisors (31942047570).

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

21212200110 is a wasteful number, since it uses less digits than its factorization.

21212200110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18273.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21212200110 its reverse (1100221212), we get a palindrome (22312421322).

The spelling of 21212200110 in words is "twenty-one billion, two hundred twelve million, two hundred thousand, one hundred ten".