30721228420 has 12 divisors (see below), whose sum is σ = 64514579724. Its totient is φ = 12288491360.

The previous prime is 30721228403. The next prime is 30721228441. The reversal of 30721228420 is 2482212703.

It can be written as a sum of positive squares in 2 ways, for example, as 21268722244 + 9452506176 = 145838^2 + 97224^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 768030691 + ... + 768030730.

It is an arithmetic number, because the mean of its divisors is an integer number (5376214977).

Almost surely, 2^30721228420 is an apocalyptic number.

It is an amenable number.

30721228420 is an abundant number, since it is smaller than the sum of its proper divisors (33793351304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30721228420 is a wasteful number, since it uses less digits than its factorization.

30721228420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536061430 (or 1536061428 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The spelling of 30721228420 in words is "thirty billion, seven hundred twenty-one million, two hundred twenty-eight thousand, four hundred twenty".