21148570 has 8 divisors (see below), whose sum is σ = 38067444. Its totient is φ = 8459424.

The previous prime is 21148559. The next prime is 21148573. The reversal of 21148570 is 7584112.

It can be written as a sum of positive squares in 2 ways, for example, as 21077281 + 71289 = 4591^2 + 267^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21148573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1057419 + ... + 1057438.

Almost surely, 2^21148570 is an apocalyptic number.

21148570 is a deficient number, since it is larger than the sum of its proper divisors (16918874).

21148570 is a wasteful number, since it uses less digits than its factorization.

21148570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114864.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 21148570 is about 4598.7574408747. The cubic root of 21148570 is about 276.5415136916.

The spelling of 21148570 in words is "twenty-one million, one hundred forty-eight thousand, five hundred seventy".