30021312 has 28 divisors (see below), whose sum is σ = 79431896. Its totient is φ = 10007040.

The previous prime is 30021289. The next prime is 30021317. The reversal of 30021312 is 21312003.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (30021317) 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, 77989 + ... + 78372.

Almost surely, 2^30021312 is an apocalyptic number.

30021312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

30021312 is an abundant number, since it is smaller than the sum of its proper divisors (49410584).

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

30021312 is a wasteful number, since it uses less digits than its factorization.

30021312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156376 (or 156366 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 30021312 is about 5479.1707401759. The cubic root of 30021312 is about 310.7968124444.

Adding to 30021312 its reverse (21312003), we get a palindrome (51333315).

It can be divided in two parts, 300 and 21312, that added together give a palindrome (21612).

The spelling of 30021312 in words is "thirty million, twenty-one thousand, three hundred twelve".