1024541666221 has 4 divisors (see below), whose sum is σ = 1024704324000. Its totient is φ = 1024379008444.

The previous prime is 1024541666131. The next prime is 1024541666231. The reversal of 1024541666221 is 1226661454201.

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 1024541666221 - 2¹³ = 1024541658029 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 (1024541666231) 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, 81319441 + ... + 81332038.

It is an arithmetic number, because the mean of its divisors is an integer number (256176081000).

Almost surely, 2^{1024541666221} is an apocalyptic number.

It is an amenable number.

1024541666221 is a deficient number, since it is larger than the sum of its proper divisors (162657779).

1024541666221 is an equidigital number, since it uses as much as digits as its factorization.

1024541666221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162657778.

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 1024541666221 in words is "one trillion, twenty-four billion, five hundred forty-one million, six hundred sixty-six thousand, two hundred twenty-one".