21411415251 has 12 divisors (see below), whose sum is σ = 31511140128. Its totient is φ = 14004950544.

The previous prime is 21411415241. The next prime is 21411415261. The reversal of 21411415251 is 15251411412.

21411415251 is a `hidden beast` number, since 21 + 4 + 114 + 1 + 525 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (21411415241) and next prime (21411415261).

It is not a de Polignac number, because 21411415251 - 2¹¹ = 21411413203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21411415241) 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 11 ways as a sum of consecutive naturals, for example, 22443355 + ... + 22444308.

It is an arithmetic number, because the mean of its divisors is an integer number (2625928344).

Almost surely, 2^21411415251 is an apocalyptic number.

21411415251 is a deficient number, since it is larger than the sum of its proper divisors (10099724877).

21411415251 is a wasteful number, since it uses less digits than its factorization.

21411415251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44887722 (or 44887719 counting only the distinct ones).

The product of its digits is 1600, while the sum is 27.

Adding to 21411415251 its reverse (15251411412), we get a palindrome (36662826663).

The spelling of 21411415251 in words is "twenty-one billion, four hundred eleven million, four hundred fifteen thousand, two hundred fifty-one".