30421530 has 24 divisors (see below), whose sum is σ = 79096212. Its totient is φ = 8112384.

The previous prime is 30421529. The next prime is 30421537. The reversal of 30421530 is 3512403.

It can be written as a sum of positive squares in 2 ways, for example, as 29387241 + 1034289 = 5421^2 + 1017^2 .

It is a super-3 number, since 3×30421530³ (a number of 23 digits) contains 333 as substring.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30421537) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 168919 + ... + 169098.

Almost surely, 2^30421530 is an apocalyptic number.

30421530 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

30421530 is an abundant number, since it is smaller than the sum of its proper divisors (48674682).

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

30421530 is a wasteful number, since it uses less digits than its factorization.

30421530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338030 (or 338027 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 30421530 is about 5515.5715932259. The cubic root of 30421530 is about 312.1718111887.

Adding to 30421530 its reverse (3512403), we get a palindrome (33933933).

The spelling of 30421530 in words is "thirty million, four hundred twenty-one thousand, five hundred thirty".