20212121021220 has 96 divisors (see below), whose sum is σ = 63678131059200. Its totient is φ = 5321672358912.

The previous prime is 20212121021149. The next prime is 20212121021269. The reversal of 20212121021220 is 2212012121202.

It is a happy number.

20212121021220 is a `hidden beast` number, since 2 + 0 + 212 + 1 + 210 + 21 + 220 = 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 = 20212121021193 and 20212121021202.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 236855149 + ... + 236940468.

It is an arithmetic number, because the mean of its divisors is an integer number (663313865200).

Almost surely, 2^{20212121021220} is an apocalyptic number.

20212121021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212121021220 is an abundant number, since it is smaller than the sum of its proper divisors (43466010037980).

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

20212121021220 is a wasteful number, since it uses less digits than its factorization.

20212121021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473795714 (or 473795706 counting only the distinct ones).

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

Adding to 20212121021220 its reverse (2212012121202), we get a palindrome (22424133142422).

The spelling of 20212121021220 in words is "twenty trillion, two hundred twelve billion, one hundred twenty-one million, twenty-one thousand, two hundred twenty".