2052001221661 has 4 divisors (see below), whose sum is σ = 2052623232000. Its totient is φ = 2051379211324.

The previous prime is 2052001221623. The next prime is 2052001221671. The reversal of 2052001221661 is 1661221002502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2052001221661 - 2¹³ = 2052001213469 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 (2052001221671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311000221 + ... + 311006818.

It is an arithmetic number, because the mean of its divisors is an integer number (513155808000).

Almost surely, 2^{2052001221661} is an apocalyptic number.

It is an amenable number.

2052001221661 is a deficient number, since it is larger than the sum of its proper divisors (622010339).

2052001221661 is an equidigital number, since it uses as much as digits as its factorization.

2052001221661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622010338.

The product of its (nonzero) digits is 2880, while the sum is 28.

The spelling of 2052001221661 in words is "two trillion, fifty-two billion, one million, two hundred twenty-one thousand, six hundred sixty-one".