21343170 has 32 divisors (see below), whose sum is σ = 52316928. Its totient is φ = 5570048.

The previous prime is 21343163. The next prime is 21343187. The reversal of 21343170 is 7134312.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6159 + ... + 8978.

It is an arithmetic number, because the mean of its divisors is an integer number (1634904).

Almost surely, 2^21343170 is an apocalyptic number.

21343170 is an abundant number, since it is smaller than the sum of its proper divisors (30973758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21343170 is a wasteful number, since it uses less digits than its factorization.

21343170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15194.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21343170 is about 4619.8668811991. The cubic root of 21343170 is about 277.3871304636.

Adding to 21343170 its reverse (7134312), we get a palindrome (28477482).

The spelling of 21343170 in words is "twenty-one million, three hundred forty-three thousand, one hundred seventy".