21925147 has 8 divisors (see below), whose sum is σ = 22365200. Its totient is φ = 21488544.

The previous prime is 21925139. The next prime is 21925151. The reversal of 21925147 is 74152912.

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

It is a cyclic number.

It is not a de Polignac number, because 21925147 - 2³ = 21925139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21925117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14629 + ... + 16057.

It is an arithmetic number, because the mean of its divisors is an integer number (2795650).

Almost surely, 2^21925147 is an apocalyptic number.

21925147 is a deficient number, since it is larger than the sum of its proper divisors (440053).

21925147 is a wasteful number, since it uses less digits than its factorization.

21925147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725.

The product of its digits is 5040, while the sum is 31.

The square root of 21925147 is about 4682.4296043828. The cubic root of 21925147 is about 279.8857824964.

The spelling of 21925147 in words is "twenty-one million, nine hundred twenty-five thousand, one hundred forty-seven".