2001221021210 has 16 divisors (see below), whose sum is σ = 3690056322792. Its totient is φ = 780964300800.

The previous prime is 2001221021179. The next prime is 2001221021213. The reversal of 2001221021210 is 121201221002.

It can be written as a sum of positive squares in 4 ways, for example, as 1481816855401 + 519404165809 = 1217299^2 + 720697^2 .

It is not an unprimeable number, because it can be changed into a prime (2001221021213) 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, 2440513031 + ... + 2440513850.

Almost surely, 2^{2001221021210} is an apocalyptic number.

2001221021210 is a deficient number, since it is larger than the sum of its proper divisors (1688835301582).

2001221021210 is a wasteful number, since it uses less digits than its factorization.

2001221021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4881026929.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2001221021210 its reverse (121201221002), we get a palindrome (2122422242212).

The spelling of 2001221021210 in words is "two trillion, one billion, two hundred twenty-one million, twenty-one thousand, two hundred ten".