21226563423 has 36 divisors (see below), whose sum is σ = 33907030560. Its totient is φ = 12784531968.

The previous prime is 21226563373. The next prime is 21226563433. The reversal of 21226563423 is 32436562212.

21226563423 is a `hidden beast` number, since 2 + 1 + 226 + 5 + 6 + 3 + 423 = 666.

It is not a de Polignac number, because 21226563423 - 2⁶ = 21226563359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21226563433) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 76978 + ... + 219951.

It is an arithmetic number, because the mean of its divisors is an integer number (941861960).

Almost surely, 2^21226563423 is an apocalyptic number.

21226563423 is a deficient number, since it is larger than the sum of its proper divisors (12680467137).

21226563423 is a wasteful number, since it uses less digits than its factorization.

21226563423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297008 (or 296992 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

The spelling of 21226563423 in words is "twenty-one billion, two hundred twenty-six million, five hundred sixty-three thousand, four hundred twenty-three".