20012021212120 has 128 divisors (see below), whose sum is σ = 54493212672000. Its totient is φ = 6456866420736.

The previous prime is 20012021212111. The next prime is 20012021212181. The reversal of 20012021212120 is 2121212021002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20012021212094 and 20012021212103.

It is a congruent number.

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, 39077481 + ... + 39586279.

It is an arithmetic number, because the mean of its divisors is an integer number (425728224000).

Almost surely, 2^{20012021212120} is an apocalyptic number.

20012021212120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20012021212120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27246606336000).

20012021212120 is an abundant number, since it is smaller than the sum of its proper divisors (34481191459880).

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

20012021212120 is a wasteful number, since it uses less digits than its factorization.

20012021212120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517097 (or 517093 counting only the distinct ones).

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

Adding to 20012021212120 its reverse (2121212021002), we get a palindrome (22133233233122).

The spelling of 20012021212120 in words is "twenty trillion, twelve billion, twenty-one million, two hundred twelve thousand, one hundred twenty".