21230648 has 16 divisors (see below), whose sum is σ = 40733880. Its totient is φ = 10368288.

The previous prime is 21230641. The next prime is 21230689. The reversal of 21230648 is 84603212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230641) 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, 30515 + ... + 31202.

Almost surely, 2^21230648 is an apocalyptic number.

It is an amenable number.

21230648 is a deficient number, since it is larger than the sum of its proper divisors (19503232).

21230648 is a wasteful number, since it uses less digits than its factorization.

21230648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61766 (or 61762 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 21230648 is about 4607.6727314340. The cubic root of 21230648 is about 276.8988061508.

The spelling of 21230648 in words is "twenty-one million, two hundred thirty thousand, six hundred forty-eight".