21621223632326 has 8 divisors (see below), whose sum is σ = 32433233381784. Its totient is φ = 10810145838400.

The previous prime is 21621223632293. The next prime is 21621223632331. The reversal of 21621223632326 is 62323632212612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21621223632326² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232930880 + ... + 233023683.

It is an arithmetic number, because the mean of its divisors is an integer number (4054154172723).

Almost surely, 2^{21621223632326} is an apocalyptic number.

21621223632326 is a deficient number, since it is larger than the sum of its proper divisors (10812009749458).

21621223632326 is a wasteful number, since it uses less digits than its factorization.

21621223632326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465977766.

The product of its digits is 373248, while the sum is 41.

Adding to 21621223632326 its reverse (62323632212612), we get a palindrome (83944855844938).

The spelling of 21621223632326 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred twenty-three million, six hundred thirty-two thousand, three hundred twenty-six".