30421987561 has 9 divisors (see below), whose sum is σ = 35390262999. Its totient is φ = 26074942824.

The previous prime is 30421987549. The next prime is 30421987573. The reversal of 30421987561 is 16578912403.

The square root of 30421987561 is 174419.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (30421987549) and next prime (30421987573).

It can be written as a sum of positive squares in only one way, i.e., 20965592025 + 9456395536 = 144795^2 + 97244^2 .

It is not a de Polignac number, because 30421987561 - 2⁵ = 30421987529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30421981561) 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 8 ways as a sum of consecutive naturals, for example, 1208475 + ... + 1233391.

It is a 2-persistent number, because it is pandigital, and so is 2⋅30421987561 = 60843975122, but 3⋅30421987561 = 91265962683 is not.

Almost surely, 2^30421987561 is an apocalyptic number.

30421987561 is the 174419-th square number.

30421987561 is the 87210-th centered octagonal number.

It is an amenable number.

30421987561 is a deficient number, since it is larger than the sum of its proper divisors (4968275438).

30421987561 is an frugal number, since it uses more digits than its factorization.

30421987561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49848 (or 24924 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 30421987561 in words is "thirty billion, four hundred twenty-one million, nine hundred eighty-seven thousand, five hundred sixty-one".