2122201661 has 8 divisors (see below), whose sum is σ = 2178506880. Its totient is φ = 2066212512.

The previous prime is 2122201633. The next prime is 2122201667. The reversal of 2122201661 is 1661022212.

It is a happy number.

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 2122201661 - 2¹⁴ = 2122185277 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 (2122201667) 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, 65381 + ... + 92298.

It is an arithmetic number, because the mean of its divisors is an integer number (272313360).

Almost surely, 2^2122201661 is an apocalyptic number.

It is an amenable number.

2122201661 is a deficient number, since it is larger than the sum of its proper divisors (56305219).

2122201661 is a wasteful number, since it uses less digits than its factorization.

2122201661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158035.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 2122201661 is about 46067.3600394032. The cubic root of 2122201661 is about 1285.0762087966.

Adding to 2122201661 its reverse (1661022212), we get a palindrome (3783223873).

The spelling of 2122201661 in words is "two billion, one hundred twenty-two million, two hundred one thousand, six hundred sixty-one".