20001221221112 has 32 divisors (see below), whose sum is σ = 38715914373120. Its totient is φ = 9677041943520.

The previous prime is 20001221221063. The next prime is 20001221221139. The reversal of 20001221221112 is 21112212210002.

It is a super-2 number, since 2×20001221221112² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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, 1547948 + ... + 6511419.

It is an arithmetic number, because the mean of its divisors is an integer number (1209872324160).

Almost surely, 2^{20001221221112} is an apocalyptic number.

It is an amenable number.

20001221221112 is a deficient number, since it is larger than the sum of its proper divisors (18714693152008).

20001221221112 is a wasteful number, since it uses less digits than its factorization.

20001221221112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8069411 (or 8069407 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20001221221112 its reverse (21112212210002), we get a palindrome (41113433431114).

The spelling of 20001221221112 in words is "twenty trillion, one billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred twelve".