21774030 has 16 divisors (see below), whose sum is σ = 52257744. Its totient is φ = 5806400.

The previous prime is 21774017. The next prime is 21774047. The reversal of 21774030 is 3047712.

It is a congruent number.

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, 362871 + ... + 362930.

It is an arithmetic number, because the mean of its divisors is an integer number (3266109).

Almost surely, 2^21774030 is an apocalyptic number.

21774030 is an abundant number, since it is smaller than the sum of its proper divisors (30483714).

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

21774030 is a wasteful number, since it uses less digits than its factorization.

21774030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725811.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 21774030 is about 4666.2651017704. The cubic root of 21774030 is about 279.2412707223.

It can be divided in two parts, 217 and 74030, that added together give a palindrome (74247).

The spelling of 21774030 in words is "twenty-one million, seven hundred seventy-four thousand, thirty".