21152630 has 16 divisors (see below), whose sum is σ = 38504160. Its totient is φ = 8365632.

The previous prime is 21152591. The next prime is 21152657. The reversal of 21152630 is 3625112.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10994 + ... + 12773.

It is an arithmetic number, because the mean of its divisors is an integer number (2406510).

Almost surely, 2^21152630 is an apocalyptic number.

21152630 is a deficient number, since it is larger than the sum of its proper divisors (17351530).

21152630 is a wasteful number, since it uses less digits than its factorization.

21152630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23863.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 21152630 is about 4599.1988432769. The cubic root of 21152630 is about 276.5592089259.

Adding to 21152630 its reverse (3625112), we get a palindrome (24777742).

The spelling of 21152630 in words is "twenty-one million, one hundred fifty-two thousand, six hundred thirty".