21220010112 has 64 divisors (see below), whose sum is σ = 64417896000. Its totient is φ = 6062859264.

The previous prime is 21220010107. The next prime is 21220010137. The reversal of 21220010112 is 21101002212.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3944487 + ... + 3949862.

It is an arithmetic number, because the mean of its divisors is an integer number (1006529625).

Almost surely, 2^21220010112 is an apocalyptic number.

It is an amenable number.

21220010112 is an abundant number, since it is smaller than the sum of its proper divisors (43197885888).

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

21220010112 is an equidigital number, since it uses as much as digits as its factorization.

21220010112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7894373 (or 7894361 counting only the distinct ones).

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

Adding to 21220010112 its reverse (21101002212), we get a palindrome (42321012324).

The spelling of 21220010112 in words is "twenty-one billion, two hundred twenty million, ten thousand, one hundred twelve".