20121121022220 has 72 divisors (see below), whose sum is σ = 61035986998896. Its totient is φ = 5365463490432.

The previous prime is 20121121022209. The next prime is 20121121022237. The reversal of 20121121022220 is 2222012112102.

It is a happy number.

20121121022220 is a `hidden beast` number, since 2 + 0 + 1 + 211 + 210 + 22 + 220 = 666.

It is a super-2 number, since 2×20121121022220² (a number of 27 digits) contains 22 as substring.

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 = 20121121022193 and 20121121022202.

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, 4032834 + ... + 7517046.

Almost surely, 2^{20121121022220} is an apocalyptic number.

20121121022220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121121022220 is an abundant number, since it is smaller than the sum of its proper divisors (40914865976676).

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

20121121022220 is a wasteful number, since it uses less digits than its factorization.

20121121022220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3516311 (or 3516306 counting only the distinct ones).

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

Adding to 20121121022220 its reverse (2222012112102), we get a palindrome (22343133134322).

The spelling of 20121121022220 in words is "twenty trillion, one hundred twenty-one billion, one hundred twenty-one million, twenty-two thousand, two hundred twenty".