21146210 has 8 divisors (see below), whose sum is σ = 38063196. Its totient is φ = 8458480.

The previous prime is 21146207. The next prime is 21146231. The reversal of 21146210 is 1264112.

It can be written as a sum of positive squares in 2 ways, for example, as 19616041 + 1530169 = 4429^2 + 1237^2 .

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

It is a Curzon number.

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, 1057301 + ... + 1057320.

Almost surely, 2^21146210 is an apocalyptic number.

21146210 is a deficient number, since it is larger than the sum of its proper divisors (16916986).

21146210 is a wasteful number, since it uses less digits than its factorization.

21146210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114628.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 21146210 is about 4598.5008426660. The cubic root of 21146210 is about 276.5312267510.

The spelling of 21146210 in words is "twenty-one million, one hundred forty-six thousand, two hundred ten".