21270147 has 8 divisors (see below), whose sum is σ = 29593344. Its totient is φ = 13563528.

The previous prime is 21270143. The next prime is 21270157. The reversal of 21270147 is 74107212.

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

It is not a de Polignac number, because 21270147 - 2² = 21270143 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21270143) 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, 154063 + ... + 154200.

It is an arithmetic number, because the mean of its divisors is an integer number (3699168).

Almost surely, 2^21270147 is an apocalyptic number.

21270147 is a deficient number, since it is larger than the sum of its proper divisors (8323197).

21270147 is a wasteful number, since it uses less digits than its factorization.

21270147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308289.

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 21270147 is about 4611.9569599032. The cubic root of 21270147 is about 277.0704204785.

Adding to 21270147 its reverse (74107212), we get a palindrome (95377359).

The spelling of 21270147 in words is "twenty-one million, two hundred seventy thousand, one hundred forty-seven".