30216021 has 16 divisors (see below), whose sum is σ = 46536768. Its totient is φ = 17235200.

The previous prime is 30215993. The next prime is 30216029. The reversal of 30216021 is 12061203.

It is a cyclic number.

It is not a de Polignac number, because 30216021 - 2⁶ = 30215957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30216029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26370 + ... + 27491.

It is an arithmetic number, because the mean of its divisors is an integer number (2908548).

Almost surely, 2^30216021 is an apocalyptic number.

It is an amenable number.

30216021 is a deficient number, since it is larger than the sum of its proper divisors (16320747).

30216021 is a wasteful number, since it uses less digits than its factorization.

30216021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53892.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 30216021 is about 5496.9101320651. The cubic root of 30216021 is about 311.4672759119.

Adding to 30216021 its reverse (12061203), we get a palindrome (42277224).

The spelling of 30216021 in words is "thirty million, two hundred sixteen thousand, twenty-one".