30221534 has 12 divisors (see below), whose sum is σ = 52733664. Its totient is φ = 12952044.

The previous prime is 30221507. The next prime is 30221537. The reversal of 30221534 is 43512203.

It is a happy number.

It is a super-2 number, since 2×30221534² = 1826682234626312, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30221537) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 154094 + ... + 154289.

It is an arithmetic number, because the mean of its divisors is an integer number (4394472).

Almost surely, 2^30221534 is an apocalyptic number.

30221534 is a deficient number, since it is larger than the sum of its proper divisors (22512130).

30221534 is a wasteful number, since it uses less digits than its factorization.

30221534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308399 (or 308392 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 30221534 is about 5497.4115727313. The cubic root of 30221534 is about 311.4862174603.

Adding to 30221534 its reverse (43512203), we get a palindrome (73733737).

The spelling of 30221534 in words is "thirty million, two hundred twenty-one thousand, five hundred thirty-four".