21299630 has 48 divisors (see below), whose sum is σ = 43666560. Its totient is φ = 7465920.

The previous prime is 21299611. The next prime is 21299639. The reversal of 21299630 is 3699212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21299639) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34787 + ... + 35393.

It is an arithmetic number, because the mean of its divisors is an integer number (909720).

Almost surely, 2^21299630 is an apocalyptic number.

21299630 is an abundant number, since it is smaller than the sum of its proper divisors (22366930).

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

21299630 is a wasteful number, since it uses less digits than its factorization.

21299630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 21299630 is about 4615.1522185081. The cubic root of 21299630 is about 277.1983790953.

The spelling of 21299630 in words is "twenty-one million, two hundred ninety-nine thousand, six hundred thirty".