30221661 has 8 divisors (see below), whose sum is σ = 40322880. Its totient is φ = 20134112.

The previous prime is 30221627. The next prime is 30221663. The reversal of 30221661 is 16612203.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30221661 - 2¹⁰ = 30220637 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30221663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4120 + ... + 8798.

It is an arithmetic number, because the mean of its divisors is an integer number (5040360).

Almost surely, 2^30221661 is an apocalyptic number.

It is an amenable number.

30221661 is a deficient number, since it is larger than the sum of its proper divisors (10101219).

30221661 is a wasteful number, since it uses less digits than its factorization.

30221661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6835.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 30221661 is about 5497.4231236098. The cubic root of 30221661 is about 311.4866537794.

Adding to 30221661 its reverse (16612203), we get a palindrome (46833864).

The spelling of 30221661 in words is "thirty million, two hundred twenty-one thousand, six hundred sixty-one".