21443213502524 has 12 divisors (see below), whose sum is σ = 40937043959448. Its totient is φ = 9746915228400.

The previous prime is 21443213502493. The next prime is 21443213502547. The reversal of 21443213502524 is 42520531234412.

It is a super-2 number, since 2×21443213502524² (a number of 27 digits) contains 22 as substring.

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, 243672880667 + ... + 243672880754.

It is an arithmetic number, because the mean of its divisors is an integer number (3411420329954).

Almost surely, 2^{21443213502524} is an apocalyptic number.

It is an amenable number.

21443213502524 is a deficient number, since it is larger than the sum of its proper divisors (19493830456924).

21443213502524 is a wasteful number, since it uses less digits than its factorization.

21443213502524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487345761436 (or 487345761434 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 38.

Adding to 21443213502524 its reverse (42520531234412), we get a palindrome (63963744736936).

The spelling of 21443213502524 in words is "twenty-one trillion, four hundred forty-three billion, two hundred thirteen million, five hundred two thousand, five hundred twenty-four".