30001221 has 6 divisors (see below), whose sum is σ = 43335110. Its totient is φ = 20000808.

The previous prime is 30001201. The next prime is 30001241. The reversal of 30001221 is 12210003.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (30001201) and next prime (30001241).

It can be written as a sum of positive squares in only one way, i.e., 18610596 + 11390625 = 4314^2 + 3375^2 .

It is not a de Polignac number, because 30001221 - 2⁶ = 30001157 is a prime.

It is a super-2 number, since 2×30001221² = 1800146522981682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 3333469 = 30001221 / (3 + 0 + 0 + 0 + 1 + 2 + 2 + 1).

It is a Duffinian number.

30001221 is a modest number, since divided by 1221 gives 30 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30001201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1666726 + ... + 1666743.

Almost surely, 2^30001221 is an apocalyptic number.

It is an amenable number.

30001221 is a deficient number, since it is larger than the sum of its proper divisors (13333889).

30001221 is a wasteful number, since it uses less digits than its factorization.

30001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3333475 (or 3333472 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 30001221 is about 5477.3370354580. The cubic root of 30001221 is about 310.7274660170.

Adding to 30001221 its reverse (12210003), we get a palindrome (42211224).

The spelling of 30001221 in words is "thirty million, one thousand, two hundred twenty-one".