21650946 has 8 divisors (see below), whose sum is σ = 43301904. Its totient is φ = 7216980.

The previous prime is 21650939. The next prime is 21650947. The reversal of 21650946 is 64905612.

It is a sphenic number, since it is the product of 3 distinct primes.

21650946 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21650947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1804240 + ... + 1804251.

It is an arithmetic number, because the mean of its divisors is an integer number (5412738).

Almost surely, 2^21650946 is an apocalyptic number.

21650946 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21650946 is a wasteful number, since it uses less digits than its factorization.

21650946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3608496.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 21650946 is about 4653.0577043488. The cubic root of 21650946 is about 278.7141121594.

The spelling of 21650946 in words is "twenty-one million, six hundred fifty thousand, nine hundred forty-six".