21143146 has 8 divisors (see below), whose sum is σ = 32808420. Its totient is φ = 10207008.

The previous prime is 21143137. The next prime is 21143179. The reversal of 21143146 is 64134112.

It can be written as a sum of positive squares in 2 ways, for example, as 20930625 + 212521 = 4575^2 + 461^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182211 + ... + 182326.

Almost surely, 2^21143146 is an apocalyptic number.

21143146 is a deficient number, since it is larger than the sum of its proper divisors (11665274).

21143146 is a wasteful number, since it uses less digits than its factorization.

21143146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364568.

The product of its digits is 576, while the sum is 22.

The square root of 21143146 is about 4598.1676785433. The cubic root of 21143146 is about 276.5178700217.

Adding to 21143146 its reverse (64134112), we get a palindrome (85277258).

The spelling of 21143146 in words is "twenty-one million, one hundred forty-three thousand, one hundred forty-six".