30511421 has 8 divisors (see below), whose sum is σ = 32101944. Its totient is φ = 28961280.

The previous prime is 30511417. The next prime is 30511423. The reversal of 30511421 is 12411503.

It can be written as a sum of positive squares in 4 ways, for example, as 151321 + 30360100 = 389^2 + 5510^2 .

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 30511421 - 2² = 30511417 is a prime.

It is a super-2 number, since 2×30511421² = 1861893622878482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30511421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30511423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8540 + ... + 11573.

It is an arithmetic number, because the mean of its divisors is an integer number (4012743).

Almost surely, 2^30511421 is an apocalyptic number.

It is an amenable number.

30511421 is a deficient number, since it is larger than the sum of its proper divisors (1590523).

30511421 is a wasteful number, since it uses less digits than its factorization.

30511421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20191.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 30511421 is about 5523.7144205688. The cubic root of 30511421 is about 312.4789822664.

Adding to 30511421 its reverse (12411503), we get a palindrome (42922924).

The spelling of 30511421 in words is "thirty million, five hundred eleven thousand, four hundred twenty-one".