20021100100120 has 32 divisors (see below), whose sum is σ = 51482828829600. Its totient is φ = 6864377177088.

The previous prime is 20021100100069. The next prime is 20021100100121. The reversal of 20021100100120 is 2100100112002.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20021100100097 and 20021100100106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021100100121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35751964185 + ... + 35751964744.

It is an arithmetic number, because the mean of its divisors is an integer number (1608838400925).

Almost surely, 2^{20021100100120} is an apocalyptic number.

20021100100120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021100100120 is an abundant number, since it is smaller than the sum of its proper divisors (31461728729480).

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

20021100100120 is a wasteful number, since it uses less digits than its factorization.

20021100100120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71503928947 (or 71503928943 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20021100100120 its reverse (2100100112002), we get a palindrome (22121200212122).

The spelling of 20021100100120 in words is "twenty trillion, twenty-one billion, one hundred million, one hundred thousand, one hundred twenty".