21496409855 has 8 divisors (see below), whose sum is σ = 26085531600. Its totient is φ = 17003901376.

The previous prime is 21496409833. The next prime is 21496409863. The reversal of 21496409855 is 55890469412.

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 21496409855 - 2¹⁸ = 21496147711 is a prime.

It is a super-2 number, since 2×21496409855² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21496409797 and 21496409806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24152825 + ... + 24153714.

It is an arithmetic number, because the mean of its divisors is an integer number (3260691450).

Almost surely, 2^21496409855 is an apocalyptic number.

21496409855 is a deficient number, since it is larger than the sum of its proper divisors (4589121745).

21496409855 is an equidigital number, since it uses as much as digits as its factorization.

21496409855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48306633.

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 21496409855 in words is "twenty-one billion, four hundred ninety-six million, four hundred nine thousand, eight hundred fifty-five".