3552721621 has 4 divisors (see below), whose sum is σ = 3552865632. Its totient is φ = 3552577612.

The previous prime is 3552721609. The next prime is 3552721633. The reversal of 3552721621 is 1261272553.

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 an interprime number because it is at equal distance from previous prime (3552721609) and next prime (3552721633).

It is a cyclic number.

It is not a de Polignac number, because 3552721621 - 2¹⁷ = 3552590549 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 (3552721691) 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, 24595 + ... + 87808.

It is an arithmetic number, because the mean of its divisors is an integer number (888216408).

Almost surely, 2^3552721621 is an apocalyptic number.

It is an amenable number.

3552721621 is a deficient number, since it is larger than the sum of its proper divisors (144011).

3552721621 is a wasteful number, since it uses less digits than its factorization.

3552721621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144010.

The product of its digits is 25200, while the sum is 34.

The square root of 3552721621 is about 59604.7113993516. The cubic root of 3552721621 is about 1525.8800432987.

The spelling of 3552721621 in words is "three billion, five hundred fifty-two million, seven hundred twenty-one thousand, six hundred twenty-one".