1048639209621 has 4 divisors (see below), whose sum is σ = 1398185612832. Its totient is φ = 699092806412.

The previous prime is 1048639209589. The next prime is 1048639209637. The reversal of 1048639209621 is 1269029368401.

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 1048639209621 - 2⁵ = 1048639209589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1048639209641) 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 3 ways as a sum of consecutive naturals, for example, 174773201601 + ... + 174773201606.

It is an arithmetic number, because the mean of its divisors is an integer number (349546403208).

Almost surely, 2^{1048639209621} is an apocalyptic number.

It is an amenable number.

1048639209621 is a deficient number, since it is larger than the sum of its proper divisors (349546403211).

1048639209621 is an equidigital number, since it uses as much as digits as its factorization.

1048639209621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349546403210.

The product of its (nonzero) digits is 1119744, while the sum is 51.

The spelling of 1048639209621 in words is "one trillion, forty-eight billion, six hundred thirty-nine million, two hundred nine thousand, six hundred twenty-one".