21548651171 has 16 divisors (see below), whose sum is σ = 22750077504. Its totient is φ = 20369885184.

The previous prime is 21548651167. The next prime is 21548651209. The reversal of 21548651171 is 17115684512.

It is a cyclic number.

It is not a de Polignac number, because 21548651171 - 2² = 21548651167 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21548651471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1628735 + ... + 1641911.

It is an arithmetic number, because the mean of its divisors is an integer number (1421879844).

Almost surely, 2^21548651171 is an apocalyptic number.

21548651171 is a deficient number, since it is larger than the sum of its proper divisors (1201426333).

21548651171 is a wasteful number, since it uses less digits than its factorization.

21548651171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14030.

The product of its digits is 67200, while the sum is 41.

The spelling of 21548651171 in words is "twenty-one billion, five hundred forty-eight million, six hundred fifty-one thousand, one hundred seventy-one".