21174090 has 32 divisors (see below), whose sum is σ = 58078080. Its totient is φ = 4839744.

The previous prime is 21174059. The next prime is 21174121. The reversal of 21174090 is 9047112.

It is an interprime number because it is at equal distance from previous prime (21174059) and next prime (21174121).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21174090.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50205 + ... + 50624.

It is an arithmetic number, because the mean of its divisors is an integer number (1814940).

Almost surely, 2^21174090 is an apocalyptic number.

21174090 is an abundant number, since it is smaller than the sum of its proper divisors (36903990).

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

21174090 is a wasteful number, since it uses less digits than its factorization.

21174090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100846.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 21174090 is about 4601.5312668719. The cubic root of 21174090 is about 276.6527032839.

The spelling of 21174090 in words is "twenty-one million, one hundred seventy-four thousand, ninety".