21430130 has 16 divisors (see below), whose sum is σ = 39904920. Its totient is φ = 8276352.

The previous prime is 21430121. The next prime is 21430139. The reversal of 21430130 is 3103412.

It is an interprime number because it is at equal distance from previous prime (21430121) and next prime (21430139).

It can be written as a sum of positive squares in 4 ways, for example, as 19018321 + 2411809 = 4361^2 + 1553^2 .

It is not an unprimeable number, because it can be changed into a prime (21430139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36659 + ... + 37238.

Almost surely, 2^21430130 is an apocalyptic number.

21430130 is a deficient number, since it is larger than the sum of its proper divisors (18474790).

21430130 is a wasteful number, since it uses less digits than its factorization.

21430130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73933.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21430130 is about 4629.2688407566. The cubic root of 21430130 is about 277.7633460354.

Adding to 21430130 its reverse (3103412), we get a palindrome (24533542).

The spelling of 21430130 in words is "twenty-one million, four hundred thirty thousand, one hundred thirty".