20001021210120 has 64 divisors (see below), whose sum is σ = 60099999336000. Its totient is φ = 5324989148928.

The previous prime is 20001021210103. The next prime is 20001021210127. The reversal of 20001021210120 is 2101212010002.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20001021210096 and 20001021210105.

It is not an unprimeable number, because it can be changed into a prime (20001021210127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134558335 + ... + 134706894.

It is an arithmetic number, because the mean of its divisors is an integer number (939062489625).

Almost surely, 2^{20001021210120} is an apocalyptic number.

20001021210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001021210120 is an abundant number, since it is smaller than the sum of its proper divisors (40098978125880).

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

20001021210120 is a wasteful number, since it uses less digits than its factorization.

20001021210120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269265862 (or 269265858 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20001021210120 its reverse (2101212010002), we get a palindrome (22102233220122).

The spelling of 20001021210120 in words is "twenty trillion, one billion, twenty-one million, two hundred ten thousand, one hundred twenty".