2001221000122 has 4 divisors (see below), whose sum is σ = 3001831500186. Its totient is φ = 1000610500060.

The previous prime is 2001221000113. The next prime is 2001221000131. The reversal of 2001221000122 is 2210001221002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2001221000113) and next prime (2001221000131).

It can be written as a sum of positive squares in only one way, i.e., 1513345292761 + 487875707361 = 1230181^2 + 698481^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500305250029 + ... + 500305250032.

Almost surely, 2^{2001221000122} is an apocalyptic number.

2001221000122 is a deficient number, since it is larger than the sum of its proper divisors (1000610500064).

2001221000122 is a wasteful number, since it uses less digits than its factorization.

2001221000122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000610500063.

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

Adding to 2001221000122 its reverse (2210001221002), we get a palindrome (4211222221124).

The spelling of 2001221000122 in words is "two trillion, one billion, two hundred twenty-one million, one hundred twenty-two", and thus it is an aban number.