2001210221 has 8 divisors (see below), whose sum is σ = 2073613080. Its totient is φ = 1929033792.

The previous prime is 2001210187. The next prime is 2001210223. The reversal of 2001210221 is 1220121002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 23629321 + 1977580900 = 4861^2 + 44470^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001210221 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 (2001210223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38510 + ... + 74063.

It is an arithmetic number, because the mean of its divisors is an integer number (259201635).

Almost surely, 2^2001210221 is an apocalyptic number.

It is an amenable number.

2001210221 is a deficient number, since it is larger than the sum of its proper divisors (72402859).

2001210221 is a wasteful number, since it uses less digits than its factorization.

2001210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113215.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2001210221 is about 44734.8881858444. Note that the first 3 decimals coincide. The cubic root of 2001210221 is about 1260.1751291386.

Adding to 2001210221 its reverse (1220121002), we get a palindrome (3221331223).

The spelling of 2001210221 in words is "two billion, one million, two hundred ten thousand, two hundred twenty-one".