20212120121220 has 72 divisors (see below), whose sum is σ = 61686233359296. Its totient is φ = 5356831828032.

The previous prime is 20212120121129. The next prime is 20212120121233. The reversal of 20212120121220 is 2212102121202.

It is a happy number.

20212120121220 is a `hidden beast` number, since 20 + 212 + 1 + 201 + 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 = 20212120121193 and 20212120121202.

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, 344417152 + ... + 344475831.

Almost surely, 2^{20212120121220} is an apocalyptic number.

20212120121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212120121220 is an abundant number, since it is smaller than the sum of its proper divisors (41474113238076).

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

20212120121220 is a wasteful number, since it uses less digits than its factorization.

20212120121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688893161 (or 688893156 counting only the distinct ones).

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

Adding to 20212120121220 its reverse (2212102121202), we get a palindrome (22424222242422).

The spelling of 20212120121220 in words is "twenty trillion, two hundred twelve billion, one hundred twenty million, one hundred twenty-one thousand, two hundred twenty".