38421721 has 8 divisors (see below), whose sum is σ = 41961024. Its totient is φ = 34965840.

The previous prime is 38421703. The next prime is 38421727. The reversal of 38421721 is 12712483.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 38421721 - 2⁹ = 38421209 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 38421721.

It is not an unprimeable number, because it can be changed into a prime (38421727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19891 + ... + 21736.

It is an arithmetic number, because the mean of its divisors is an integer number (5245128).

Almost surely, 2^38421721 is an apocalyptic number.

It is an amenable number.

38421721 is a deficient number, since it is larger than the sum of its proper divisors (3539303).

38421721 is a wasteful number, since it uses less digits than its factorization.

38421721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41711.

The product of its digits is 2688, while the sum is 28.

The square root of 38421721 is about 6198.5257118124. The cubic root of 38421721 is about 337.4366659392.

The spelling of 38421721 in words is "thirty-eight million, four hundred twenty-one thousand, seven hundred twenty-one".