21415487055 has 16 divisors (see below), whose sum is σ = 34344290304. Its totient is φ = 11395089440.

The previous prime is 21415487033. The next prime is 21415487123. The reversal of 21415487055 is 55078451412.

It is a happy number.

It is not a de Polignac number, because 21415487055 - 2¹⁰ = 21415486031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21415486998 and 21415487016.

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, 1649799 + ... + 1662728.

It is an arithmetic number, because the mean of its divisors is an integer number (2146518144).

Almost surely, 2^21415487055 is an apocalyptic number.

21415487055 is a deficient number, since it is larger than the sum of its proper divisors (12928803249).

21415487055 is a wasteful number, since it uses less digits than its factorization.

21415487055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3312966.

The product of its (nonzero) digits is 224000, while the sum is 42.

The spelling of 21415487055 in words is "twenty-one billion, four hundred fifteen million, four hundred eighty-seven thousand, fifty-five".