2001020012221 has 8 divisors (see below), whose sum is σ = 2003147766200. Its totient is φ = 1998892546560.

The previous prime is 2001020012209. The next prime is 2001020012281. The reversal of 2001020012221 is 1222100201002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 41050812100 + 1959969200121 = 202610^2 + 1399989^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2001020012221 - 2⁹ = 2001020011709 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 (2001020012281) 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, 15617065 + ... + 15744673.

It is an arithmetic number, because the mean of its divisors is an integer number (250393470775).

Almost surely, 2^{2001020012221} is an apocalyptic number.

It is an amenable number.

2001020012221 is a deficient number, since it is larger than the sum of its proper divisors (2127753979).

2001020012221 is a wasteful number, since it uses less digits than its factorization.

2001020012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144159.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2001020012221 its reverse (1222100201002), we get a palindrome (3223120213223).

The spelling of 2001020012221 in words is "two trillion, one billion, twenty million, twelve thousand, two hundred twenty-one".