21220020100312 has 16 divisors (see below), whose sum is σ = 43404586569000. Its totient is φ = 9645463681920.

The previous prime is 21220020100297. The next prime is 21220020100333. The reversal of 21220020100312 is 21300102002212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120568295937 + ... + 120568296112.

Almost surely, 2^{21220020100312} is an apocalyptic number.

21220020100312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21220020100312 is an abundant number, since it is smaller than the sum of its proper divisors (22184566468688).

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

21220020100312 is a wasteful number, since it uses less digits than its factorization.

21220020100312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241136592066 (or 241136592062 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21220020100312 its reverse (21300102002212), we get a palindrome (42520122102524).

The spelling of 21220020100312 in words is "twenty-one trillion, two hundred twenty billion, twenty million, one hundred thousand, three hundred twelve".