21506832441223 has 2 divisors, whose sum is σ = 21506832441224. Its totient is φ = 21506832441222.

The previous prime is 21506832441187. The next prime is 21506832441337. The reversal of 21506832441223 is 32214423860512.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21506832441223 - 2²⁹ = 21506295570311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21506832441223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21506832441023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10753416220611 + 10753416220612.

It is an arithmetic number, because the mean of its divisors is an integer number (10753416220612).

Almost surely, 2^{21506832441223} is an apocalyptic number.

21506832441223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21506832441223 is an equidigital number, since it uses as much as digits as its factorization.

21506832441223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 552960, while the sum is 43.

The spelling of 21506832441223 in words is "twenty-one trillion, five hundred six billion, eight hundred thirty-two million, four hundred forty-one thousand, two hundred twenty-three".