21126504733 has 4 divisors (see below), whose sum is σ = 21126958720. Its totient is φ = 21126050748.

The previous prime is 21126504731. The next prime is 21126504767. The reversal of 21126504733 is 33740562112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21126504733 - 2¹ = 21126504731 is a prime.

It is a Duffinian number.

It is a congruent number.

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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148035 + ... + 253312.

It is an arithmetic number, because the mean of its divisors is an integer number (5281739680).

Almost surely, 2^21126504733 is an apocalyptic number.

It is an amenable number.

21126504733 is a deficient number, since it is larger than the sum of its proper divisors (453987).

21126504733 is an equidigital number, since it uses as much as digits as its factorization.

21126504733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453986.

The product of its (nonzero) digits is 30240, while the sum is 34.

The spelling of 21126504733 in words is "twenty-one billion, one hundred twenty-six million, five hundred four thousand, seven hundred thirty-three".