20001201212120 has 16 divisors (see below), whose sum is σ = 45002702727360. Its totient is φ = 8000480484832.

The previous prime is 20001201212119. The next prime is 20001201212183. The reversal of 20001201212120 is 2121210210002.

It is a junction number, because it is equal to n+sod(n) for n = 20001201212095 and 20001201212104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250015015112 + ... + 250015015191.

It is an arithmetic number, because the mean of its divisors is an integer number (2812668920460).

Almost surely, 2^{20001201212120} is an apocalyptic number.

20001201212120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001201212120 is an abundant number, since it is smaller than the sum of its proper divisors (25001501515240).

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

20001201212120 is a wasteful number, since it uses less digits than its factorization.

20001201212120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500030030314 (or 500030030310 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20001201212120 its reverse (2121210210002), we get a palindrome (22122411422122).

The spelling of 20001201212120 in words is "twenty trillion, one billion, two hundred one million, two hundred twelve thousand, one hundred twenty".