21126465055 has 16 divisors (see below), whose sum is σ = 26231726880. Its totient is φ = 16314782848.

The previous prime is 21126465049. The next prime is 21126465071. The reversal of 21126465055 is 55056462112.

It is a cyclic number.

It is not a de Polignac number, because 21126465055 - 2¹⁷ = 21126333983 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 781749 + ... + 808321.

It is an arithmetic number, because the mean of its divisors is an integer number (1639482930).

Almost surely, 2^21126465055 is an apocalyptic number.

21126465055 is a deficient number, since it is larger than the sum of its proper divisors (5105261825).

21126465055 is a wasteful number, since it uses less digits than its factorization.

21126465055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32090.

The product of its (nonzero) digits is 72000, while the sum is 37.

The spelling of 21126465055 in words is "twenty-one billion, one hundred twenty-six million, four hundred sixty-five thousand, fifty-five".