21222016423623 has 24 divisors (see below), whose sum is σ = 30878890473600. Its totient is φ = 14044344050880.

The previous prime is 21222016423571. The next prime is 21222016423633. The reversal of 21222016423623 is 32632461022212.

21222016423623 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 2 + 0 + 1 + 6 + 4 + 23 + 623 = 666.

It is not a de Polignac number, because 21222016423623 - 2¹⁷ = 21222016292551 is a prime.

It is a super-2 number, since 2×21222016423623² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222016423633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2742583 + ... + 7068648.

It is an arithmetic number, because the mean of its divisors is an integer number (1286620436400).

Almost surely, 2^{21222016423623} is an apocalyptic number.

21222016423623 is a deficient number, since it is larger than the sum of its proper divisors (9656874049977).

21222016423623 is a wasteful number, since it uses less digits than its factorization.

21222016423623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9812999 (or 9812996 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

Adding to 21222016423623 its reverse (32632461022212), we get a palindrome (53854477445835).

The spelling of 21222016423623 in words is "twenty-one trillion, two hundred twenty-two billion, sixteen million, four hundred twenty-three thousand, six hundred twenty-three".