21953319508003 has 4 divisors (see below), whose sum is σ = 23642036393248. Its totient is φ = 20264602622760.

The previous prime is 21953319507997. The next prime is 21953319508007. The reversal of 21953319508003 is 30080591335912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21953319508003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21953319508007) 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, 844358442603 + ... + 844358442628.

It is an arithmetic number, because the mean of its divisors is an integer number (5910509098312).

Almost surely, 2^{21953319508003} is an apocalyptic number.

21953319508003 is a deficient number, since it is larger than the sum of its proper divisors (1688716885245).

21953319508003 is a wasteful number, since it uses less digits than its factorization.

21953319508003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688716885244.

The product of its (nonzero) digits is 874800, while the sum is 49.

The spelling of 21953319508003 in words is "twenty-one trillion, nine hundred fifty-three billion, three hundred nineteen million, five hundred eight thousand, three".