21442130 has 8 divisors (see below), whose sum is σ = 38595852. Its totient is φ = 8576848.

The previous prime is 21442103. The next prime is 21442133. The reversal of 21442130 is 3124412.

It can be written as a sum of positive squares in 2 ways, for example, as 19811401 + 1630729 = 4451^2 + 1277^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21442099 and 21442108.

It is not an unprimeable number, because it can be changed into a prime (21442133) 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, 1072097 + ... + 1072116.

Almost surely, 2^21442130 is an apocalyptic number.

21442130 is a deficient number, since it is larger than the sum of its proper divisors (17153722).

21442130 is a wasteful number, since it uses less digits than its factorization.

21442130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2144220.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21442130 is about 4630.5647603721. The cubic root of 21442130 is about 277.8151817484.

Adding to 21442130 its reverse (3124412), we get a palindrome (24566542).

The spelling of 21442130 in words is "twenty-one million, four hundred forty-two thousand, one hundred thirty".