30172121 has 8 divisors (see below), whose sum is σ = 34516800. Its totient is φ = 25836048.

The previous prime is 30172117. The next prime is 30172139. The reversal of 30172121 is 12127103.

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

It is not a de Polignac number, because 30172121 - 2² = 30172117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 30172121.

It is not an unprimeable number, because it can be changed into a prime (30172421) 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, 9830 + ... + 12528.

It is an arithmetic number, because the mean of its divisors is an integer number (4314600).

Almost surely, 2^30172121 is an apocalyptic number.

It is an amenable number.

30172121 is a deficient number, since it is larger than the sum of its proper divisors (4344679).

30172121 is a wasteful number, since it uses less digits than its factorization.

30172121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4303.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 30172121 is about 5492.9155282054. The cubic root of 30172121 is about 311.3163621448.

Adding to 30172121 its reverse (12127103), we get a palindrome (42299224).

The spelling of 30172121 in words is "thirty million, one hundred seventy-two thousand, one hundred twenty-one".