21976340353 has 4 divisors (see below), whose sum is σ = 23974189488. Its totient is φ = 19978491220.

The previous prime is 21976340327. The next prime is 21976340359. The reversal of 21976340353 is 35304367912.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-21976340353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21976340359) 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 3 ways as a sum of consecutive naturals, for example, 998924551 + ... + 998924572.

It is an arithmetic number, because the mean of its divisors is an integer number (5993547372).

Almost surely, 2^21976340353 is an apocalyptic number.

It is an amenable number.

21976340353 is a deficient number, since it is larger than the sum of its proper divisors (1997849135).

21976340353 is a wasteful number, since it uses less digits than its factorization.

21976340353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997849134.

The product of its (nonzero) digits is 408240, while the sum is 43.

The spelling of 21976340353 in words is "twenty-one billion, nine hundred seventy-six million, three hundred forty thousand, three hundred fifty-three".