21500160242723 has 4 divisors (see below), whose sum is σ = 21794682985848. Its totient is φ = 21205637499600.

The previous prime is 21500160242707. The next prime is 21500160242747. The reversal of 21500160242723 is 32724206100512.

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

It is a cyclic number.

It is not a de Polignac number, because 21500160242723 - 2⁴ = 21500160242707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21500160202723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147261371453 + ... + 147261371598.

It is an arithmetic number, because the mean of its divisors is an integer number (5448670746462).

Almost surely, 2^{21500160242723} is an apocalyptic number.

21500160242723 is a deficient number, since it is larger than the sum of its proper divisors (294522743125).

21500160242723 is an equidigital number, since it uses as much as digits as its factorization.

21500160242723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294522743124.

The product of its (nonzero) digits is 40320, while the sum is 35.

The spelling of 21500160242723 in words is "twenty-one trillion, five hundred billion, one hundred sixty million, two hundred forty-two thousand, seven hundred twenty-three".