21234170 has 16 divisors (see below), whose sum is σ = 38275848. Its totient is φ = 8481600.

The previous prime is 21234151. The next prime is 21234203. The reversal of 21234170 is 7143212.

It can be written as a sum of positive squares in 4 ways, for example, as 6265009 + 14969161 = 2503^2 + 3869^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10220 + ... + 12120.

Almost surely, 2^21234170 is an apocalyptic number.

21234170 is a deficient number, since it is larger than the sum of its proper divisors (17041678).

21234170 is a wasteful number, since it uses less digits than its factorization.

21234170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3025.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21234170 is about 4608.0549041868. The cubic root of 21234170 is about 276.9141170930.

Adding to 21234170 its reverse (7143212), we get a palindrome (28377382).

The spelling of 21234170 in words is "twenty-one million, two hundred thirty-four thousand, one hundred seventy".