201012021 has 24 divisors (see below), whose sum is σ = 343274880. Its totient is φ = 110902176.

The previous prime is 201011983. The next prime is 201012047. The reversal of 201012021 is 120210102.

It is not a de Polignac number, because 201012021 - 2¹⁴ = 200995637 is a prime.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 201011994 and 201012012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201012121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53185 + ... + 56838.

It is an arithmetic number, because the mean of its divisors is an integer number (14303120).

Almost surely, 2^201012021 is an apocalyptic number.

201012021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

201012021 is a deficient number, since it is larger than the sum of its proper divisors (142262859).

201012021 is a wasteful number, since it uses less digits than its factorization.

201012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110065 (or 110062 counting only the distinct ones).

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

The square root of 201012021 is about 14177.8708204018. The cubic root of 201012021 is about 585.7882776782.

Adding to 201012021 its reverse (120210102), we get a palindrome (321222123).

It can be divided in two parts, 20101 and 2021, that added together give a palindrome (22122).

The spelling of 201012021 in words is "two hundred one million, twelve thousand, twenty-one".