30881000221 has 4 divisors (see below), whose sum is σ = 30910106844. Its totient is φ = 30851893600.

The previous prime is 30881000201. The next prime is 30881000243. The reversal of 30881000221 is 12200018803.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12200018803 = 7 ⋅1742859829.

It can be written as a sum of positive squares in 2 ways, for example, as 13585068025 + 17295932196 = 116555^2 + 131514^2 .

It is a cyclic number.

It is not a de Polignac number, because 30881000221 - 2¹¹ = 30880998173 is a prime.

It is a super-3 number, since 3×30881000221³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30881000201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14551720 + ... + 14553841.

It is an arithmetic number, because the mean of its divisors is an integer number (7727526711).

Almost surely, 2^30881000221 is an apocalyptic number.

It is an amenable number.

30881000221 is a deficient number, since it is larger than the sum of its proper divisors (29106623).

30881000221 is a wasteful number, since it uses less digits than its factorization.

30881000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29106622.

The product of its (nonzero) digits is 768, while the sum is 25.

The spelling of 30881000221 in words is "thirty billion, eight hundred eighty-one million, two hundred twenty-one", and thus it is an aban number.