201021030 has 144 divisors (see below), whose sum is σ = 616749120. Its totient is φ = 45287424.

The previous prime is 201020987. The next prime is 201021043. The reversal of 201021030 is 30120102.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 348102 + ... + 348678.

It is an arithmetic number, because the mean of its divisors is an integer number (4282980).

Almost surely, 2^201021030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201021030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (308374560).

201021030 is an abundant number, since it is smaller than the sum of its proper divisors (415728090).

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

201021030 is a wasteful number, since it uses less digits than its factorization.

201021030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 201021030 is about 14178.1885302742. The cubic root of 201021030 is about 585.7970288758.

Adding to 201021030 its reverse (30120102), we get a palindrome (231141132).

The spelling of 201021030 in words is "two hundred one million, twenty-one thousand, thirty".