21450611105471 has 6 divisors (see below), whose sum is σ = 22786635326880. Its totient is φ = 20188810451936.

The previous prime is 21450611105467. The next prime is 21450611105513. The reversal of 21450611105471 is 17450111605412.

It is a happy number.

It is not a de Polignac number, because 21450611105471 - 2² = 21450611105467 is a prime.

It is a super-3 number, since 3×21450611105471³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450611105401) 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 5 ways as a sum of consecutive naturals, for example, 37111783631 + ... + 37111784208.

It is an arithmetic number, because the mean of its divisors is an integer number (3797772554480).

Almost surely, 2^{21450611105471} is an apocalyptic number.

21450611105471 is a deficient number, since it is larger than the sum of its proper divisors (1336024221409).

21450611105471 is an equidigital number, since it uses as much as digits as its factorization.

21450611105471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74223567873 (or 74223567856 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 38.

The spelling of 21450611105471 in words is "twenty-one trillion, four hundred fifty billion, six hundred eleven million, one hundred five thousand, four hundred seventy-one".