21258130 has 8 divisors (see below), whose sum is σ = 38264652. Its totient is φ = 8503248.

The previous prime is 21258121. The next prime is 21258151. The reversal of 21258130 is 3185212.

It can be written as a sum of positive squares in 2 ways, for example, as 19193161 + 2064969 = 4381^2 + 1437^2 .

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, 1062897 + ... + 1062916.

Almost surely, 2^21258130 is an apocalyptic number.

21258130 is a deficient number, since it is larger than the sum of its proper divisors (17006522).

21258130 is a wasteful number, since it uses less digits than its factorization.

21258130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125820.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 21258130 is about 4610.6539666299. The cubic root of 21258130 is about 277.0182318018.

The spelling of 21258130 in words is "twenty-one million, two hundred fifty-eight thousand, one hundred thirty".