21050305011423 has 20 divisors (see below), whose sum is σ = 31450721720968. Its totient is φ = 14031214068240.

The previous prime is 21050305011377. The next prime is 21050305011443. The reversal of 21050305011423 is 32411050305012.

21050305011423 is a `hidden beast` number, since 2 + 10 + 5 + 0 + 3 + 0 + 501 + 142 + 3 = 666.

It is not a de Polignac number, because 21050305011423 - 2¹² = 21050305007327 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050305011443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21013108 + ... + 21992073.

Almost surely, 2^{21050305011423} is an apocalyptic number.

21050305011423 is a deficient number, since it is larger than the sum of its proper divisors (10400416709545).

21050305011423 is an equidigital number, since it uses as much as digits as its factorization.

21050305011423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43011236 (or 43011227 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 21050305011423 its reverse (32411050305012), we get a palindrome (53461355316435).

The spelling of 21050305011423 in words is "twenty-one trillion, fifty billion, three hundred five million, eleven thousand, four hundred twenty-three".