21382270 has 32 divisors (see below), whose sum is σ = 47371968. Its totient is φ = 6766848.

The previous prime is 21382247. The next prime is 21382271. The reversal of 21382270 is 7228312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21382271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10839 + ... + 12658.

It is an arithmetic number, because the mean of its divisors is an integer number (1480374).

Almost surely, 2^21382270 is an apocalyptic number.

21382270 is an abundant number, since it is smaller than the sum of its proper divisors (25989698).

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

21382270 is a wasteful number, since it uses less digits than its factorization.

21382270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23524.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 21382270 is about 4624.0966685397. The cubic root of 21382270 is about 277.5564152271.

The spelling of 21382270 in words is "twenty-one million, three hundred eighty-two thousand, two hundred seventy".