21212301110 has 128 divisors (see below), whose sum is σ = 51337165824. Its totient is φ = 6094517760.

The previous prime is 21212301067. The next prime is 21212301203. The reversal of 21212301110 is 1110321212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12141257 + ... + 12143003.

It is an arithmetic number, because the mean of its divisors is an integer number (401071608).

Almost surely, 2^21212301110 is an apocalyptic number.

21212301110 is an abundant number, since it is smaller than the sum of its proper divisors (30124864714).

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

21212301110 is a wasteful number, since it uses less digits than its factorization.

21212301110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2998.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21212301110 its reverse (1110321212), we get a palindrome (22322622322).

The spelling of 21212301110 in words is "twenty-one billion, two hundred twelve million, three hundred one thousand, one hundred ten".