21507532324126 has 4 divisors (see below), whose sum is σ = 32261298486192. Its totient is φ = 10753766162062.

The previous prime is 21507532324087. The next prime is 21507532324163. The reversal of 21507532324126 is 62142323570512.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5376883081030 + ... + 5376883081033.

It is an arithmetic number, because the mean of its divisors is an integer number (8065324621548).

Almost surely, 2^{21507532324126} is an apocalyptic number.

21507532324126 is a deficient number, since it is larger than the sum of its proper divisors (10753766162066).

21507532324126 is a wasteful number, since it uses less digits than its factorization.

21507532324126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10753766162065.

The product of its (nonzero) digits is 604800, while the sum is 43.

Adding to 21507532324126 its reverse (62142323570512), we get a palindrome (83649855894638).

The spelling of 21507532324126 in words is "twenty-one trillion, five hundred seven billion, five hundred thirty-two million, three hundred twenty-four thousand, one hundred twenty-six".