21252343126 has 16 divisors (see below), whose sum is σ = 36446333184. Its totient is φ = 9104710824.

The previous prime is 21252343121. The next prime is 21252343159. The reversal of 21252343126 is 62134325212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252343121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247740 + ... + 322303.

It is an arithmetic number, because the mean of its divisors is an integer number (2277895824).

Almost surely, 2^21252343126 is an apocalyptic number.

21252343126 is a deficient number, since it is larger than the sum of its proper divisors (15193990058).

21252343126 is a wasteful number, since it uses less digits than its factorization.

21252343126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572715.

The product of its digits is 17280, while the sum is 31.

Adding to 21252343126 its reverse (62134325212), we get a palindrome (83386668338).

The spelling of 21252343126 in words is "twenty-one billion, two hundred fifty-two million, three hundred forty-three thousand, one hundred twenty-six".