21146147 has 8 divisors (see below), whose sum is σ = 24425712. Its totient is φ = 18092800.

The previous prime is 21146137. The next prime is 21146161. The reversal of 21146147 is 74164112.

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

It is not a de Polignac number, because 21146147 - 2¹⁶ = 21080611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21146137) 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, 56354 + ... + 56727.

It is an arithmetic number, because the mean of its divisors is an integer number (3053214).

Almost surely, 2^21146147 is an apocalyptic number.

21146147 is a deficient number, since it is larger than the sum of its proper divisors (3279565).

21146147 is a wasteful number, since it uses less digits than its factorization.

21146147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113109.

The product of its digits is 1344, while the sum is 26.

The square root of 21146147 is about 4598.4939926024. The cubic root of 21146147 is about 276.5309521315.

The spelling of 21146147 in words is "twenty-one million, one hundred forty-six thousand, one hundred forty-seven".