30102721 has 8 divisors (see below), whose sum is σ = 32880384. Its totient is φ = 27331920.

The previous prime is 30102703. The next prime is 30102739. The reversal of 30102721 is 12720103.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (30102703) and next prime (30102739).

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

It is not a de Polignac number, because 30102721 - 2²¹ = 28005569 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30102695 and 30102704.

It is not an unprimeable number, because it can be changed into a prime (30102221) 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, 12976 + ... + 15118.

It is an arithmetic number, because the mean of its divisors is an integer number (4110048).

Almost surely, 2^30102721 is an apocalyptic number.

It is an amenable number.

30102721 is a deficient number, since it is larger than the sum of its proper divisors (2777663).

30102721 is a wasteful number, since it uses less digits than its factorization.

30102721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3431.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 30102721 is about 5486.5946633590. The cubic root of 30102721 is about 311.0774888505.

Adding to 30102721 its reverse (12720103), we get a palindrome (42822824).

The spelling of 30102721 in words is "thirty million, one hundred two thousand, seven hundred twenty-one".