21141630 has 24 divisors (see below), whose sum is σ = 54968472. Its totient is φ = 5637744.

The previous prime is 21141629. The next prime is 21141641. The reversal of 21141630 is 3614112.

It is a happy number.

21141630 is a `hidden beast` number, since 21 + 14 + 1 + 630 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 11 ways as a sum of consecutive naturals, for example, 117364 + ... + 117543.

It is an arithmetic number, because the mean of its divisors is an integer number (2290353).

Almost surely, 2^21141630 is an apocalyptic number.

21141630 is an abundant number, since it is smaller than the sum of its proper divisors (33826842).

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

21141630 is a wasteful number, since it uses less digits than its factorization.

21141630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234920 (or 234917 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21141630 is about 4598.0028273154. The cubic root of 21141630 is about 276.5112609278.

Adding to 21141630 its reverse (3614112), we get a palindrome (24755742).

The spelling of 21141630 in words is "twenty-one million, one hundred forty-one thousand, six hundred thirty".