21063015055 has 8 divisors (see below), whose sum is σ = 25281392832. Its totient is φ = 16846562208.

The previous prime is 21063015047. The next prime is 21063015059. The reversal of 21063015055 is 55051036012.

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 21063015055 - 2³ = 21063015047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21063015059) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 457047 + ... + 501016.

It is an arithmetic number, because the mean of its divisors is an integer number (3160174104).

Almost surely, 2^21063015055 is an apocalyptic number.

21063015055 is a deficient number, since it is larger than the sum of its proper divisors (4218377777).

21063015055 is an equidigital number, since it uses as much as digits as its factorization.

21063015055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962465.

The product of its (nonzero) digits is 4500, while the sum is 28.

The spelling of 21063015055 in words is "twenty-one billion, sixty-three million, fifteen thousand, fifty-five".