21773147 has 8 divisors (see below), whose sum is σ = 23798640. Its totient is φ = 19755360.

The previous prime is 21773137. The next prime is 21773149. The reversal of 21773147 is 74137712.

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 21773147 - 2¹⁰ = 21772123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21773149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5129 + ... + 8357.

It is an arithmetic number, because the mean of its divisors is an integer number (2974830).

Almost surely, 2^21773147 is an apocalyptic number.

21773147 is a deficient number, since it is larger than the sum of its proper divisors (2025493).

21773147 is a wasteful number, since it uses less digits than its factorization.

21773147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3853.

The product of its digits is 8232, while the sum is 32.

The square root of 21773147 is about 4666.1704855266. The cubic root of 21773147 is about 279.2374959904.

The spelling of 21773147 in words is "twenty-one million, seven hundred seventy-three thousand, one hundred forty-seven".