2001021201 has 48 divisors (see below), whose sum is σ = 3066066432. Its totient is φ = 1255737600.

The previous prime is 2001021181. The next prime is 2001021223. The reversal of 2001021201 is 1021201002.

It is not a de Polignac number, because 2001021201 - 2⁷ = 2001021073 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (2001021251) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1936581 + ... + 1937613.

It is an arithmetic number, because the mean of its divisors is an integer number (63876384).

Almost surely, 2^2001021201 is an apocalyptic number.

It is an amenable number.

2001021201 is a deficient number, since it is larger than the sum of its proper divisors (1065045231).

2001021201 is a wasteful number, since it uses less digits than its factorization.

2001021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254 (or 1251 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 2001021201 is about 44732.7754672120. The cubic root of 2001021201 is about 1260.1354521804.

Adding to 2001021201 its reverse (1021201002), we get a palindrome (3022222203).

The spelling of 2001021201 in words is "two billion, one million, twenty-one thousand, two hundred one".