21126504737 has 8 divisors (see below), whose sum is σ = 22930768896. Its totient is φ = 19347833232.

The previous prime is 21126504731. The next prime is 21126504767. The reversal of 21126504737 is 73740562112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21126504737 - 2²⁴ = 21109727521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21126504737.

It is not an unprimeable number, because it can be changed into a prime (21126504731) by changing a digit.

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, 6396443 + ... + 6399744.

It is an arithmetic number, because the mean of its divisors is an integer number (2866346112).

Almost surely, 2^21126504737 is an apocalyptic number.

It is an amenable number.

21126504737 is a deficient number, since it is larger than the sum of its proper divisors (1804264159).

21126504737 is a wasteful number, since it uses less digits than its factorization.

21126504737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12796327.

The product of its (nonzero) digits is 70560, while the sum is 38.

The spelling of 21126504737 in words is "twenty-one billion, one hundred twenty-six million, five hundred four thousand, seven hundred thirty-seven".