21417630 has 32 divisors (see below), whose sum is σ = 55357344. Its totient is φ = 5271936.

The previous prime is 21417629. The next prime is 21417659. The reversal of 21417630 is 3671412.

It is a self number, because there is not a number n which added to its sum of digits gives 21417630.

It is a congruent number.

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, 27069 + ... + 27848.

It is an arithmetic number, because the mean of its divisors is an integer number (1729917).

Almost surely, 2^21417630 is an apocalyptic number.

21417630 is an abundant number, since it is smaller than the sum of its proper divisors (33939714).

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

21417630 is a wasteful number, since it uses less digits than its factorization.

21417630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54940.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21417630 is about 4627.9185386089. The cubic root of 21417630 is about 277.7093299202.

The spelling of 21417630 in words is "twenty-one million, four hundred seventeen thousand, six hundred thirty".