21014442424 has 16 divisors (see below), whose sum is σ = 41719849200. Its totient is φ = 9889149312.

The previous prime is 21014442419. The next prime is 21014442433. The reversal of 21014442424 is 42424441012.

It is a happy number.

It is a super-2 number, since 2×21014442424² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21014442392 and 21014442401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77258844 + ... + 77259115.

It is an arithmetic number, because the mean of its divisors is an integer number (2607490575).

Almost surely, 2^21014442424 is an apocalyptic number.

It is an amenable number.

21014442424 is a deficient number, since it is larger than the sum of its proper divisors (20705406776).

21014442424 is a wasteful number, since it uses less digits than its factorization.

21014442424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154517982 (or 154517978 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 28.

Adding to 21014442424 its reverse (42424441012), we get a palindrome (63438883436).

The spelling of 21014442424 in words is "twenty-one billion, fourteen million, four hundred forty-two thousand, four hundred twenty-four".