201001221021 has 16 divisors (see below), whose sum is σ = 275279136704. Its totient is φ = 130362960384.

The previous prime is 201001221011. The next prime is 201001221137. The reversal of 201001221021 is 120122100102.

It is not a de Polignac number, because 201001221021 - 2¹³ = 201001212829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201001220988 and 201001221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201001221011) 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 15 ways as a sum of consecutive naturals, for example, 818790 + ... + 1035576.

It is an arithmetic number, because the mean of its divisors is an integer number (17204946044).

Almost surely, 2^201001221021 is an apocalyptic number.

It is an amenable number.

201001221021 is a deficient number, since it is larger than the sum of its proper divisors (74277915683).

201001221021 is a wasteful number, since it uses less digits than its factorization.

201001221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225180.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 201001221021 its reverse (120122100102), we get a palindrome (321123321123).

The spelling of 201001221021 in words is "two hundred one billion, one million, two hundred twenty-one thousand, twenty-one".