21930616 has 16 divisors (see below), whose sum is σ = 41199840. Its totient is φ = 10944000.

The previous prime is 21930611. The next prime is 21930619. The reversal of 21930616 is 61603912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21930611) 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, 2241 + ... + 6991.

It is an arithmetic number, because the mean of its divisors is an integer number (2574990).

Almost surely, 2^21930616 is an apocalyptic number.

It is an amenable number.

21930616 is a deficient number, since it is larger than the sum of its proper divisors (19269224).

21930616 is a wasteful number, since it uses less digits than its factorization.

21930616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5334 (or 5330 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 21930616 is about 4683.0135596643. The cubic root of 21930616 is about 279.9090520947.

The spelling of 21930616 in words is "twenty-one million, nine hundred thirty thousand, six hundred sixteen".