201021102 has 40 divisors (see below), whose sum is σ = 474150600. Its totient is φ = 63479376.

The previous prime is 201021101. The next prime is 201021113. The reversal of 201021102 is 201120102.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021101) 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 19 ways as a sum of consecutive naturals, for example, 29577 + ... + 35732.

It is an arithmetic number, because the mean of its divisors is an integer number (11853765).

Almost surely, 2^201021102 is an apocalyptic number.

201021102 is an abundant number, since it is smaller than the sum of its proper divisors (273129498).

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

201021102 is a wasteful number, since it uses less digits than its factorization.

201021102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65342 (or 65333 counting only the distinct ones).

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

The square root of 201021102 is about 14178.1910693854. The cubic root of 201021102 is about 585.7970988144.

Adding to 201021102 its reverse (201120102), we get a palindrome (402141204).

The spelling of 201021102 in words is "two hundred one million, twenty-one thousand, one hundred two".