30721228421 has 8 divisors (see below), whose sum is σ = 34825684320. Its totient is φ = 26865527472.

The previous prime is 30721228403. The next prime is 30721228441. The reversal of 30721228421 is 12482212703.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30721228421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30721228441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62188475 + ... + 62188968.

It is an arithmetic number, because the mean of its divisors is an integer number (4353210540).

Almost surely, 2^30721228421 is an apocalyptic number.

It is an amenable number.

30721228421 is a deficient number, since it is larger than the sum of its proper divisors (4104455899).

30721228421 is a wasteful number, since it uses less digits than its factorization.

30721228421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124377475.

The product of its (nonzero) digits is 10752, while the sum is 32.

The spelling of 30721228421 in words is "thirty billion, seven hundred twenty-one million, two hundred twenty-eight thousand, four hundred twenty-one".