21051066463 has 4 divisors (see below), whose sum is σ = 24058361680. Its totient is φ = 18043771248.

The previous prime is 21051066437. The next prime is 21051066479. The reversal of 21051066463 is 36466015012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21051066463 - 2²⁹ = 20514195551 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 (21051066163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1503647598 + ... + 1503647611.

It is an arithmetic number, because the mean of its divisors is an integer number (6014590420).

Almost surely, 2^21051066463 is an apocalyptic number.

21051066463 is a deficient number, since it is larger than the sum of its proper divisors (3007295217).

21051066463 is an equidigital number, since it uses as much as digits as its factorization.

21051066463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3007295216.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 21051066463 in words is "twenty-one billion, fifty-one million, sixty-six thousand, four hundred sixty-three".