201021212021021 has 4 divisors (see below), whose sum is σ = 229738528024032. Its totient is φ = 172303896018012.

The previous prime is 201021212020943. The next prime is 201021212021027. The reversal of 201021212021021 is 120120212120102.

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 a de Polignac number, because none of the positive numbers 2^k-201021212021021 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 (201021212021027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14358658001495 + ... + 14358658001508.

It is an arithmetic number, because the mean of its divisors is an integer number (57434632006008).

Almost surely, 2^{201021212021021} is an apocalyptic number.

It is an amenable number.

201021212021021 is a deficient number, since it is larger than the sum of its proper divisors (28717316003011).

201021212021021 is an equidigital number, since it uses as much as digits as its factorization.

201021212021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28717316003010.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 201021212021021 its reverse (120120212120102), we get a palindrome (321141424141123).

The spelling of 201021212021021 in words is "two hundred one trillion, twenty-one billion, two hundred twelve million, twenty-one thousand, twenty-one".