21451453171 has 8 divisors (see below), whose sum is σ = 22463790624. Its totient is φ = 20445754560.

The previous prime is 21451453123. The next prime is 21451453189. The reversal of 21451453171 is 17135415412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21451453171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21451453271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1653096 + ... + 1666021.

It is an arithmetic number, because the mean of its divisors is an integer number (2807973828).

Almost surely, 2^21451453171 is an apocalyptic number.

21451453171 is a deficient number, since it is larger than the sum of its proper divisors (1012337453).

21451453171 is a wasteful number, since it uses less digits than its factorization.

21451453171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3319421.

The product of its digits is 16800, while the sum is 34.

Adding to 21451453171 its reverse (17135415412), we get a palindrome (38586868583).

The spelling of 21451453171 in words is "twenty-one billion, four hundred fifty-one million, four hundred fifty-three thousand, one hundred seventy-one".