305225021 has 8 divisors (see below), whose sum is σ = 323334144. Its totient is φ = 287133120.

The previous prime is 305225009. The next prime is 305225047. The reversal of 305225021 is 120522503.

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 305225021 - 2¹⁸ = 304962877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 305224984 and 305225002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305225621) 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, 58406 + ... + 63416.

It is an arithmetic number, because the mean of its divisors is an integer number (40416768).

Almost surely, 2^305225021 is an apocalyptic number.

It is an amenable number.

305225021 is a deficient number, since it is larger than the sum of its proper divisors (18109123).

305225021 is a wasteful number, since it uses less digits than its factorization.

305225021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8611.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 305225021 is about 17470.6903412544. The cubic root of 305225021 is about 673.2970486334.

Adding to 305225021 its reverse (120522503), we get a palindrome (425747524).

It can be divided in two parts, 30522502 and 1, that added together give a palindrome (30522503).

The spelling of 305225021 in words is "three hundred five million, two hundred twenty-five thousand, twenty-one".