201001021221 has 128 divisors (see below), whose sum is σ = 373239078912. Its totient is φ = 92845440000.

The previous prime is 201001021201. The next prime is 201001021349. The reversal of 201001021221 is 122120100102.

201001021221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 201001021221 - 2⁵ = 201001021189 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 201001021197 and 201001021206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201001021201) 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 127 ways as a sum of consecutive naturals, for example, 11213256 + ... + 11231166.

It is an arithmetic number, because the mean of its divisors is an integer number (2915930304).

Almost surely, 2^201001021221 is an apocalyptic number.

201001021221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

201001021221 is a deficient number, since it is larger than the sum of its proper divisors (172238057691).

201001021221 is a wasteful number, since it uses less digits than its factorization.

201001021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18083.

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

Adding to 201001021221 its reverse (122120100102), we get a palindrome (323121121323).

It can be divided in two parts, 20100102 and 1221, that multiplied together give a palindrome (24542224542).

The spelling of 201001021221 in words is "two hundred one billion, one million, twenty-one thousand, two hundred twenty-one".