2566101221 has 8 divisors (see below), whose sum is σ = 2794303200. Its totient is φ = 2347213680.

The previous prime is 2566101211. The next prime is 2566101269. The reversal of 2566101221 is 1221016652.

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 2566101221 - 2¹⁴ = 2566084837 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 (2566101211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2328035 + ... + 2329136.

It is an arithmetic number, because the mean of its divisors is an integer number (349287900).

Almost surely, 2^2566101221 is an apocalyptic number.

It is an amenable number.

2566101221 is a deficient number, since it is larger than the sum of its proper divisors (228201979).

2566101221 is a wasteful number, since it uses less digits than its factorization.

2566101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4657219.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 2566101221 is about 50656.6996654934. The cubic root of 2566101221 is about 1369.0666598281.

Adding to 2566101221 its reverse (1221016652), we get a palindrome (3787117873).

The spelling of 2566101221 in words is "two billion, five hundred sixty-six million, one hundred one thousand, two hundred twenty-one".