21142330 has 48 divisors (see below), whose sum is σ = 42488712. Its totient is φ = 7568000.

The previous prime is 21142291. The next prime is 21142343. The reversal of 21142330 is 3324112.

21142330 = 260² + 261² + ... + 432².

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 21040569 + 101761 = 4587^2 + 319^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122124 + ... + 122296.

Almost surely, 2^21142330 is an apocalyptic number.

21142330 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

21142330 is a wasteful number, since it uses less digits than its factorization.

21142330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21142330 is about 4598.0789466907. The cubic root of 21142330 is about 276.5143126595.

Adding to 21142330 its reverse (3324112), we get a palindrome (24466442).

It can be divided in two parts, 2114 and 2330, that added together give a palindrome (4444).

The spelling of 21142330 in words is "twenty-one million, one hundred forty-two thousand, three hundred thirty".