30841921 has 16 divisors (see below), whose sum is σ = 35663040. Its totient is φ = 26377920.

The previous prime is 30841913. The next prime is 30841933. The reversal of 30841921 is 12914803.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 30841921 - 2³ = 30841913 is a prime.

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 30841921.

It is not an unprimeable number, because it can be changed into a prime (30841981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35731 + ... + 36583.

It is an arithmetic number, because the mean of its divisors is an integer number (2228940).

Almost surely, 2^30841921 is an apocalyptic number.

It is an amenable number.

30841921 is a deficient number, since it is larger than the sum of its proper divisors (4821119).

30841921 is a wasteful number, since it uses less digits than its factorization.

30841921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 30841921 is about 5553.5503058854. The cubic root of 30841921 is about 313.6031912648.

It can be divided in two parts, 3084 and 1921, that added together give a palindrome (5005).

The spelling of 30841921 in words is "thirty million, eight hundred forty-one thousand, nine hundred twenty-one".