20122121222120 has 16 divisors (see below), whose sum is σ = 45274772749860. Its totient is φ = 8048848488832.

The previous prime is 20122121222111. The next prime is 20122121222173. The reversal of 20122121222120 is 2122212122102.

It can be written as a sum of positive squares in 2 ways, for example, as 20064110572804 + 58010649316 = 4479298^2 + 240854^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20122121222092 and 20122121222101.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251526515237 + ... + 251526515316.

Almost surely, 2^{20122121222120} is an apocalyptic number.

20122121222120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20122121222120 is an abundant number, since it is smaller than the sum of its proper divisors (25152651527740).

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

20122121222120 is a wasteful number, since it uses less digits than its factorization.

20122121222120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503053030564 (or 503053030560 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 20122121222120 its reverse (2122212122102), we get a palindrome (22244333344222).

The spelling of 20122121222120 in words is "twenty trillion, one hundred twenty-two billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty".