201022100 has 18 divisors (see below), whose sum is σ = 436218174. Its totient is φ = 80408800.

The previous prime is 201022079. The next prime is 201022103. The reversal of 201022100 is 1220102.

It can be written as a sum of positive squares in 3 ways, for example, as 1817104 + 199204996 = 1348^2 + 14114^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201022103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1005011 + ... + 1005210.

It is an arithmetic number, because the mean of its divisors is an integer number (24234343).

Almost surely, 2^201022100 is an apocalyptic number.

201022100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201022100 is an abundant number, since it is smaller than the sum of its proper divisors (235196074).

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

201022100 is a wasteful number, since it uses less digits than its factorization.

201022100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2010235 (or 2010228 counting only the distinct ones).

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

The square root of 201022100 is about 14178.2262642405. The cubic root of 201022100 is about 585.7980682393.

Adding to 201022100 its reverse (1220102), we get a palindrome (202242202).

The spelling of 201022100 in words is "two hundred one million, twenty-two thousand, one hundred".