32721621 has 4 divisors (see below), whose sum is σ = 43628832. Its totient is φ = 21814412.

The previous prime is 32721613. The next prime is 32721641. The reversal of 32721621 is 12612723.

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 32721621 - 2³ = 32721613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 32721591 and 32721600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32721641) 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, 5453601 + ... + 5453606.

It is an arithmetic number, because the mean of its divisors is an integer number (10907208).

Almost surely, 2^32721621 is an apocalyptic number.

It is an amenable number.

32721621 is a deficient number, since it is larger than the sum of its proper divisors (10907211).

32721621 is a wasteful number, since it uses less digits than its factorization.

32721621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10907210.

The product of its digits is 1008, while the sum is 24.

The square root of 32721621 is about 5720.2815490149. The cubic root of 32721621 is about 319.8489554087.

The spelling of 32721621 in words is "thirty-two million, seven hundred twenty-one thousand, six hundred twenty-one".