21266338323 has 4 divisors (see below), whose sum is σ = 28355117768. Its totient is φ = 14177558880.

The previous prime is 21266338321. The next prime is 21266338369. The reversal of 21266338323 is 32383366212.

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

It is not a de Polignac number, because 21266338323 - 2¹ = 21266338321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21266338321) 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, 3544389718 + ... + 3544389723.

It is an arithmetic number, because the mean of its divisors is an integer number (7088779442).

Almost surely, 2^21266338323 is an apocalyptic number.

21266338323 is a deficient number, since it is larger than the sum of its proper divisors (7088779445).

21266338323 is an equidigital number, since it uses as much as digits as its factorization.

21266338323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7088779444.

The product of its digits is 186624, while the sum is 39.

It can be divided in two parts, 212663 and 38323, that added together give a triangular number (250986 = T₇₀₈).

The spelling of 21266338323 in words is "twenty-one billion, two hundred sixty-six million, three hundred thirty-eight thousand, three hundred twenty-three".