201021020 has 36 divisors (see below), whose sum is σ = 427584360. Its totient is φ = 79385184.

The previous prime is 201020987. The next prime is 201021043. The reversal of 201021020 is 20120102.

It is a junction number, because it is equal to n+sod(n) for n = 201020989 and 201021007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137051 + ... + 138509.

Almost surely, 2^201021020 is an apocalyptic number.

201021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201021020 is an abundant number, since it is smaller than the sum of its proper divisors (226563340).

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

201021020 is a wasteful number, since it uses less digits than its factorization.

201021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634 (or 1549 counting only the distinct ones).

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

The square root of 201021020 is about 14178.1881776199. The cubic root of 201021020 is about 585.7970191622.

Adding to 201021020 its reverse (20120102), we get a palindrome (221141122).

The spelling of 201021020 in words is "two hundred one million, twenty-one thousand, twenty".