30123421 has 4 divisors (see below), whose sum is σ = 30179644. Its totient is φ = 30067200.

The previous prime is 30123409. The next prime is 30123437. The reversal of 30123421 is 12432103.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12432103 = 2657 ⋅4679.

It can be written as a sum of positive squares in 2 ways, for example, as 12859396 + 17264025 = 3586^2 + 4155^2 .

It is a cyclic number.

It is not a de Polignac number, because 30123421 - 2¹⁵ = 30090653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30123395 and 30123404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30123461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27300 + ... + 28381.

It is an arithmetic number, because the mean of its divisors is an integer number (7544911).

Almost surely, 2^30123421 is an apocalyptic number.

It is an amenable number.

30123421 is a deficient number, since it is larger than the sum of its proper divisors (56223).

30123421 is an equidigital number, since it uses as much as digits as its factorization.

30123421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56222.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 30123421 is about 5488.4807551817. The cubic root of 30123421 is about 311.1487761891.

Adding to 30123421 its reverse (12432103), we get a palindrome (42555524).

The spelling of 30123421 in words is "thirty million, one hundred twenty-three thousand, four hundred twenty-one".