2001221192 has 8 divisors (see below), whose sum is σ = 3752289750. Its totient is φ = 1000610592.

The previous prime is 2001221141. The next prime is 2001221203. The reversal of 2001221192 is 2911221002.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1961958436 + 39262756 = 44294^2 + 6266^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125076317 + ... + 125076332.

Almost surely, 2^2001221192 is an apocalyptic number.

It is an amenable number.

2001221192 is a deficient number, since it is larger than the sum of its proper divisors (1751068558).

2001221192 is a wasteful number, since it uses less digits than its factorization.

2001221192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250152655 (or 250152651 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 2001221192 is about 44735.0108080908. The cubic root of 2001221192 is about 1260.1774319711.

Adding to 2001221192 its reverse (2911221002), we get a palindrome (4912442194).

The spelling of 2001221192 in words is "two billion, one million, two hundred twenty-one thousand, one hundred ninety-two".