21001332420024 has 48 divisors (see below), whose sum is σ = 57710272980360. Its totient is φ = 6364040126400.

The previous prime is 21001332420017. The next prime is 21001332420059. The reversal of 21001332420024 is 42002423310012.

It is a happy number.

It is a super-2 number, since 2×21001332420024² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 21001332419976 and 21001332420003.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3615928987 + ... + 3615934794.

Almost surely, 2^{21001332420024} is an apocalyptic number.

21001332420024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21001332420024 is an abundant number, since it is smaller than the sum of its proper divisors (36708940560336).

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

21001332420024 is a wasteful number, since it uses less digits than its factorization.

21001332420024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7231863812 (or 7231863797 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21001332420024 its reverse (42002423310012), we get a palindrome (63003755730036).

The spelling of 21001332420024 in words is "twenty-one trillion, one billion, three hundred thirty-two million, four hundred twenty thousand, twenty-four".