21213260524 has 48 divisors (see below), whose sum is σ = 39410784000. Its totient is φ = 9962827200.

The previous prime is 21213260491. The next prime is 21213260533. The reversal of 21213260524 is 42506231212.

It is a junction number, because it is equal to n+sod(n) for n = 21213260492 and 21213260501.

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 15 ways as a sum of consecutive naturals, for example, 7823529 + ... + 7826239.

It is an arithmetic number, because the mean of its divisors is an integer number (821058000).

Almost surely, 2^21213260524 is an apocalyptic number.

It is an amenable number.

21213260524 is a deficient number, since it is larger than the sum of its proper divisors (18197523476).

21213260524 is a wasteful number, since it uses less digits than its factorization.

21213260524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3574 (or 3572 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 21213260524 its reverse (42506231212), we get a palindrome (63719491736).

The spelling of 21213260524 in words is "twenty-one billion, two hundred thirteen million, two hundred sixty thousand, five hundred twenty-four".