21506869276742 has 4 divisors (see below), whose sum is σ = 32260303915116. Its totient is φ = 10753434638370.

The previous prime is 21506869276741. The next prime is 21506869276757. The reversal of 21506869276742 is 24767296860512.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21506869276741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5376717319184 + ... + 5376717319187.

It is an arithmetic number, because the mean of its divisors is an integer number (8065075978779).

Almost surely, 2^{21506869276742} is an apocalyptic number.

21506869276742 is a deficient number, since it is larger than the sum of its proper divisors (10753434638374).

21506869276742 is a wasteful number, since it uses less digits than its factorization.

21506869276742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10753434638373.

The product of its (nonzero) digits is 121927680, while the sum is 65.

The spelling of 21506869276742 in words is "twenty-one trillion, five hundred six billion, eight hundred sixty-nine million, two hundred seventy-six thousand, seven hundred forty-two".