201011021 has 4 divisors (see below), whose sum is σ = 201140544. Its totient is φ = 200881500.

The previous prime is 201011003. The next prime is 201011023. The reversal of 201011021 is 120110102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201011021 - 2¹⁰ = 201009997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201011023) 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 3 ways as a sum of consecutive naturals, for example, 62405 + ... + 65546.

It is an arithmetic number, because the mean of its divisors is an integer number (50285136).

Almost surely, 2^201011021 is an apocalyptic number.

It is an amenable number.

201011021 is a deficient number, since it is larger than the sum of its proper divisors (129523).

201011021 is a wasteful number, since it uses less digits than its factorization.

201011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129522.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 201011021 is about 14177.8355541317. The cubic root of 201011021 is about 585.7873062782.

Adding to 201011021 its reverse (120110102), we get a palindrome (321121123).

It can be divided in two parts, 2010 and 11021, that added together give a palindrome (13031).

The spelling of 201011021 in words is "two hundred one million, eleven thousand, twenty-one".