30009921 has 8 divisors (see below), whose sum is σ = 40077120. Its totient is φ = 19974672.

The previous prime is 30009919. The next prime is 30009979. The reversal of 30009921 is 12990003.

It is a happy number.

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

It is not a de Polignac number, because 30009921 - 2¹ = 30009919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30009891 and 30009900.

It is not an unprimeable number, because it can be changed into a prime (30009901) 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, 5701 + ... + 9618.

It is an arithmetic number, because the mean of its divisors is an integer number (5009640).

Almost surely, 2^30009921 is an apocalyptic number.

It is an amenable number.

30009921 is a deficient number, since it is larger than the sum of its proper divisors (10067199).

30009921 is a wasteful number, since it uses less digits than its factorization.

30009921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15975.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 30009921 is about 5478.1311594375. The cubic root of 30009921 is about 310.7574988800.

Adding to 30009921 its reverse (12990003), we get a palindrome (42999924).

It can be divided in two parts, 3000 and 9921, that added together give a palindrome (12921).

The spelling of 30009921 in words is "thirty million, nine thousand, nine hundred twenty-one".