21855029323 has 2 divisors, whose sum is σ = 21855029324. Its totient is φ = 21855029322.

The previous prime is 21855029311. The next prime is 21855029347. The reversal of 21855029323 is 32392055812.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21855029323 - 2¹³ = 21855021131 is a prime.

It is not a weakly prime, because it can be changed into another prime (21855029363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10927514661 + 10927514662.

It is an arithmetic number, because the mean of its divisors is an integer number (10927514662).

Almost surely, 2^21855029323 is an apocalyptic number.

21855029323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21855029323 is an equidigital number, since it uses as much as digits as its factorization.

21855029323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 21855029323 in words is "twenty-one billion, eight hundred fifty-five million, twenty-nine thousand, three hundred twenty-three".