201022012021 has 4 divisors (see below), whose sum is σ = 201026429100. Its totient is φ = 201017594944.

The previous prime is 201022012007. The next prime is 201022012027. The reversal of 201022012021 is 120210220102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8488858225 + 192533153796 = 92135^2 + 438786^2 .

It is a cyclic number.

It is not a de Polignac number, because 201022012021 - 2²¹ = 201019914869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201022011992 and 201022012010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201022012027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2139556 + ... + 2231533.

It is an arithmetic number, because the mean of its divisors is an integer number (50256607275).

Almost surely, 2^201022012021 is an apocalyptic number.

It is an amenable number.

201022012021 is a deficient number, since it is larger than the sum of its proper divisors (4417079).

201022012021 is an equidigital number, since it uses as much as digits as its factorization.

201022012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4417078.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 201022012021 its reverse (120210220102), we get a palindrome (321232232123).

The spelling of 201022012021 in words is "two hundred one billion, twenty-two million, twelve thousand, twenty-one".