21305424410072 has 32 divisors (see below), whose sum is σ = 46142764099920. Its totient is φ = 9114620067840.

The previous prime is 21305424410071. The next prime is 21305424410107. The reversal of 21305424410072 is 27001442450312.

It is a super-2 number, since 2×21305424410072² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21305424410071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7120795433 + ... + 7120798424.

Almost surely, 2^{21305424410072} is an apocalyptic number.

21305424410072 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21305424410072 is an abundant number, since it is smaller than the sum of its proper divisors (24837339689848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21305424410072 is a wasteful number, since it uses less digits than its factorization.

21305424410072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14241593891 (or 14241593887 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 35.

Adding to 21305424410072 its reverse (27001442450312), we get a palindrome (48306866860384).

The spelling of 21305424410072 in words is "twenty-one trillion, three hundred five billion, four hundred twenty-four million, four hundred ten thousand, seventy-two".