30421520 has 20 divisors (see below), whose sum is σ = 70730220. Its totient is φ = 12168576.

The previous prime is 30421519. The next prime is 30421529. The reversal of 30421520 is 2512403.

It can be written as a sum of positive squares in 2 ways, for example, as 16908544 + 13512976 = 4112^2 + 3676^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×30421520² = 1850937758220800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30421529) 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, 190055 + ... + 190214.

It is an arithmetic number, because the mean of its divisors is an integer number (3536511).

Almost surely, 2^30421520 is an apocalyptic number.

It is an amenable number.

30421520 is an abundant number, since it is smaller than the sum of its proper divisors (40308700).

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

30421520 is a wasteful number, since it uses less digits than its factorization.

30421520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380282 (or 380276 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 30421520 is about 5515.5706867014. The cubic root of 30421520 is about 312.1717769836.

Adding to 30421520 its reverse (2512403), we get a palindrome (32933923).

The spelling of 30421520 in words is "thirty million, four hundred twenty-one thousand, five hundred twenty".