21211345524 has 24 divisors (see below), whose sum is σ = 49741854400. Its totient is φ = 7034917824.

The previous prime is 21211345517. The next prime is 21211345567. The reversal of 21211345524 is 42554311212.

It is a junction number, because it is equal to n+sod(n) for n = 21211345491 and 21211345500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4438849 + ... + 4443624.

Almost surely, 2^21211345524 is an apocalyptic number.

It is an amenable number.

21211345524 is an abundant number, since it is smaller than the sum of its proper divisors (28530508876).

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

21211345524 is a wasteful number, since it uses less digits than its factorization.

21211345524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8882679 (or 8882677 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

Adding to 21211345524 its reverse (42554311212), we get a palindrome (63765656736).

The spelling of 21211345524 in words is "twenty-one billion, two hundred eleven million, three hundred forty-five thousand, five hundred twenty-four".