20001221110012 has 12 divisors (see below), whose sum is σ = 37061086174560. Its totient is φ = 9412339345856.

The previous prime is 20001221109941. The next prime is 20001221110027. The reversal of 20001221110012 is 21001112210002.

It is a super-2 number, since 2×20001221110012² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20001221109974 and 20001221110001.

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, 147067802212 + ... + 147067802347.

It is an arithmetic number, because the mean of its divisors is an integer number (3088423847880).

Almost surely, 2^{20001221110012} is an apocalyptic number.

It is an amenable number.

20001221110012 is a deficient number, since it is larger than the sum of its proper divisors (17059865064548).

20001221110012 is a wasteful number, since it uses less digits than its factorization.

20001221110012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294135604580 (or 294135604578 counting only the distinct ones).

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

Adding to 20001221110012 its reverse (21001112210002), we get a palindrome (41002333320014).

The spelling of 20001221110012 in words is "twenty trillion, one billion, two hundred twenty-one million, one hundred ten thousand, twelve".