3477640721621 has 4 divisors (see below), whose sum is σ = 3793789878144. Its totient is φ = 3161491565100.

The previous prime is 3477640721609. The next prime is 3477640721627. The reversal of 3477640721621 is 1261270467743.

3477640721621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 3477640721621 - 2¹⁰ = 3477640720597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3477640721621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3477640721627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158074578245 + ... + 158074578266.

It is an arithmetic number, because the mean of its divisors is an integer number (948447469536).

Almost surely, 2^{3477640721621} is an apocalyptic number.

It is an amenable number.

3477640721621 is a deficient number, since it is larger than the sum of its proper divisors (316149156523).

3477640721621 is a wasteful number, since it uses less digits than its factorization.

3477640721621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316149156522.

The product of its (nonzero) digits is 2370816, while the sum is 50.

The spelling of 3477640721621 in words is "three trillion, four hundred seventy-seven billion, six hundred forty million, seven hundred twenty-one thousand, six hundred twenty-one".