20012121202120 has 16 divisors (see below), whose sum is σ = 45027272704860. Its totient is φ = 8004848480832.

The previous prime is 20012121202097. The next prime is 20012121202121. The reversal of 20012121202120 is 2120212121002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18894166014564 + 1117955187556 = 4346742^2 + 1057334^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20012121202094 and 20012121202103.

It is not an unprimeable number, because it can be changed into a prime (20012121202121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250151514987 + ... + 250151515066.

Almost surely, 2^{20012121202120} is an apocalyptic number.

20012121202120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20012121202120 is an abundant number, since it is smaller than the sum of its proper divisors (25015151502740).

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

20012121202120 is a wasteful number, since it uses less digits than its factorization.

20012121202120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500303030064 (or 500303030060 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20012121202120 its reverse (2120212121002), we get a palindrome (22132333323122).

The spelling of 20012121202120 in words is "twenty trillion, twelve billion, one hundred twenty-one million, two hundred two thousand, one hundred twenty".