21530423450115 has 40 divisors (see below), whose sum is σ = 40626608006160. Its totient is φ = 10878529739328.

The previous prime is 21530423450113. The next prime is 21530423450149. The reversal of 21530423450115 is 51105432403512.

21530423450115 is a `hidden beast` number, since 2 + 1 + 5 + 304 + 2 + 345 + 0 + 1 + 1 + 5 = 666.

It is not a de Polignac number, because 21530423450115 - 2¹ = 21530423450113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21530423450115.

It is not an unprimeable number, because it can be changed into a prime (21530423450113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1398980184 + ... + 1398995573.

It is an arithmetic number, because the mean of its divisors is an integer number (1015665200154).

Almost surely, 2^{21530423450115} is an apocalyptic number.

21530423450115 is a deficient number, since it is larger than the sum of its proper divisors (19096184556045).

21530423450115 is a wasteful number, since it uses less digits than its factorization.

21530423450115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2797975793 (or 2797975784 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

Adding to 21530423450115 its reverse (51105432403512), we get a palindrome (72635855853627).

The spelling of 21530423450115 in words is "twenty-one trillion, five hundred thirty billion, four hundred twenty-three million, four hundred fifty thousand, one hundred fifteen".