21174380 has 24 divisors (see below), whose sum is σ = 45078432. Its totient is φ = 8353152.

The previous prime is 21174371. The next prime is 21174383. The reversal of 21174380 is 8347112.

It is not an unprimeable number, because it can be changed into a prime (21174383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5792 + ... + 8711.

It is an arithmetic number, because the mean of its divisors is an integer number (1878268).

Almost surely, 2^21174380 is an apocalyptic number.

21174380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21174380 is an abundant number, since it is smaller than the sum of its proper divisors (23904052).

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

21174380 is a wasteful number, since it uses less digits than its factorization.

21174380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14585 (or 14583 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 21174380 is about 4601.5627780136. The cubic root of 21174380 is about 276.6539662885.

The spelling of 21174380 in words is "twenty-one million, one hundred seventy-four thousand, three hundred eighty".