21980435223 has 4 divisors (see below), whose sum is σ = 29307246968. Its totient is φ = 14653623480.

The previous prime is 21980435167. The next prime is 21980435227. The reversal of 21980435223 is 32253408912.

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

It is not a de Polignac number, because 21980435223 - 2⁶ = 21980435159 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 (21980435227) 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, 3663405868 + ... + 3663405873.

It is an arithmetic number, because the mean of its divisors is an integer number (7326811742).

Almost surely, 2^21980435223 is an apocalyptic number.

21980435223 is a deficient number, since it is larger than the sum of its proper divisors (7326811745).

21980435223 is an equidigital number, since it uses as much as digits as its factorization.

21980435223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7326811744.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 21980435223 in words is "twenty-one billion, nine hundred eighty million, four hundred thirty-five thousand, two hundred twenty-three".