201100102020 has 72 divisors (see below), whose sum is σ = 619108211904. Its totient is φ = 52826292288.

The previous prime is 201100102009. The next prime is 201100102051. The reversal of 201100102020 is 20201001102.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 201100101993 and 201100102011.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8325424 + ... + 8349543.

Almost surely, 2^201100102020 is an apocalyptic number.

201100102020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201100102020 is an abundant number, since it is smaller than the sum of its proper divisors (418008109884).

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

201100102020 is a wasteful number, since it uses less digits than its factorization.

201100102020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16675049 (or 16675044 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 201100102020 its reverse (20201001102), we get a palindrome (221301103122).

The spelling of 201100102020 in words is "two hundred one billion, one hundred million, one hundred two thousand, twenty".