21260520223 has 32 divisors (see below), whose sum is σ = 23307471360. Its totient is φ = 19342202880.

The previous prime is 21260520221. The next prime is 21260520227. The reversal of 21260520223 is 32202506212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21260520223 - 2¹ = 21260520221 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 (21260520221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6526011 + ... + 6529267.

It is an arithmetic number, because the mean of its divisors is an integer number (728358480).

Almost surely, 2^21260520223 is an apocalyptic number.

21260520223 is a deficient number, since it is larger than the sum of its proper divisors (2046951137).

21260520223 is a wasteful number, since it uses less digits than its factorization.

21260520223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3507.

The product of its (nonzero) digits is 2880, while the sum is 25.

The spelling of 21260520223 in words is "twenty-one billion, two hundred sixty million, five hundred twenty thousand, two hundred twenty-three".