12121022021220 has 72 divisors (see below), whose sum is σ = 42019543011264. Its totient is φ = 2770519318848.

The previous prime is 12121022021219. The next prime is 12121022021249. The reversal of 12121022021220 is 2212022012121.

It is a happy number.

12121022021220 is a `hidden beast` number, since 1 + 2 + 1 + 210 + 220 + 212 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12121022021193 and 12121022021202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4809928114 + ... + 4809930633.

Almost surely, 2^{12121022021220} is an apocalyptic number.

12121022021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121022021220 is an abundant number, since it is smaller than the sum of its proper divisors (29898520990044).

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

12121022021220 is a wasteful number, since it uses less digits than its factorization.

12121022021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9619858769 (or 9619858764 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12121022021220 its reverse (2212022012121), we get a palindrome (14333044033341).

Subtracting from 12121022021220 its reverse (2212022012121), we obtain a palindrome (9909000009099).

The spelling of 12121022021220 in words is "twelve trillion, one hundred twenty-one billion, twenty-two million, twenty-one thousand, two hundred twenty".