21251514454151 has 8 divisors (see below), whose sum is σ = 21273526076880. Its totient is φ = 21229513829568.

The previous prime is 21251514454123. The next prime is 21251514454171. The reversal of 21251514454151 is 15145441515212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21251514454151 - 2¹⁴ = 21251514437767 is a prime.

It is a super-2 number, since 2×21251514454151² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21251514454099 and 21251514454108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21251514454171) 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 7 ways as a sum of consecutive naturals, for example, 1119845 + ... + 6614913.

It is an arithmetic number, because the mean of its divisors is an integer number (2659190759610).

Almost surely, 2^{21251514454151} is an apocalyptic number.

21251514454151 is a deficient number, since it is larger than the sum of its proper divisors (22011622729).

21251514454151 is a wasteful number, since it uses less digits than its factorization.

21251514454151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5499073.

The product of its digits is 160000, while the sum is 41.

Adding to 21251514454151 its reverse (15145441515212), we get a palindrome (36396955969363).

The spelling of 21251514454151 in words is "twenty-one trillion, two hundred fifty-one billion, five hundred fourteen million, four hundred fifty-four thousand, one hundred fifty-one".