20121000020220 has 48 divisors (see below), whose sum is σ = 61460509154688. Its totient is φ = 4877818186560.

The previous prime is 20121000020183. The next prime is 20121000020267. The reversal of 20121000020220 is 2202000012102.

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

It is a junction number, because it is equal to n+sod(n) for n = 20121000020196 and 20121000020205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15243181174 + ... + 15243182493.

It is an arithmetic number, because the mean of its divisors is an integer number (1280427274056).

Almost surely, 2^{20121000020220} is an apocalyptic number.

20121000020220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121000020220 is an abundant number, since it is smaller than the sum of its proper divisors (41339509134468).

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

20121000020220 is a wasteful number, since it uses less digits than its factorization.

20121000020220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30486363690 (or 30486363688 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20121000020220 its reverse (2202000012102), we get a palindrome (22323000032322).

The spelling of 20121000020220 in words is "twenty trillion, one hundred twenty-one billion, twenty thousand, two hundred twenty".