21547474075409 has 8 divisors (see below), whose sum is σ = 21749264434368. Its totient is φ = 21345691348080.

The previous prime is 21547474075403. The next prime is 21547474075469. The reversal of 21547474075409 is 90457047474512.

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 21547474075409 - 2³⁶ = 21478754598673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21547474075403) 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 7 ways as a sum of consecutive naturals, for example, 3846299 + ... + 7608479.

It is an arithmetic number, because the mean of its divisors is an integer number (2718658054296).

Almost surely, 2^{21547474075409} is an apocalyptic number.

It is an amenable number.

21547474075409 is a deficient number, since it is larger than the sum of its proper divisors (201790358959).

21547474075409 is a wasteful number, since it uses less digits than its factorization.

21547474075409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3815815.

The product of its (nonzero) digits is 39513600, while the sum is 59.

The spelling of 21547474075409 in words is "twenty-one trillion, five hundred forty-seven billion, four hundred seventy-four million, seventy-five thousand, four hundred nine".