21161496055 has 16 divisors (see below), whose sum is σ = 29957658624. Its totient is φ = 14042651040.

The previous prime is 21161496049. The next prime is 21161496061. The reversal of 21161496055 is 55069416112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21161496049) and next prime (21161496061).

It is not a de Polignac number, because 21161496055 - 2³ = 21161496047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21161495999 and 21161496017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9750757 + ... + 9752926.

It is an arithmetic number, because the mean of its divisors is an integer number (1872353664).

Almost surely, 2^21161496055 is an apocalyptic number.

21161496055 is a deficient number, since it is larger than the sum of its proper divisors (8796162569).

21161496055 is a wasteful number, since it uses less digits than its factorization.

21161496055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19503726.

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 21161496055 in words is "twenty-one billion, one hundred sixty-one million, four hundred ninety-six thousand, fifty-five".