21662312213044 has 48 divisors (see below), whose sum is σ = 39295449381888. Its totient is φ = 10441959647328.

The previous prime is 21662312213023. The next prime is 21662312213083. The reversal of 21662312213044 is 44031221326612.

It is a junction number, because it is equal to n+sod(n) for n = 21662312212994 and 21662312213012.

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 15 ways as a sum of consecutive naturals, for example, 385951167 + ... + 386007289.

It is an arithmetic number, because the mean of its divisors is an integer number (818655195456).

Almost surely, 2^{21662312213044} is an apocalyptic number.

It is an amenable number.

21662312213044 is a deficient number, since it is larger than the sum of its proper divisors (17633137168844).

21662312213044 is a wasteful number, since it uses less digits than its factorization.

21662312213044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86884 (or 86882 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

Adding to 21662312213044 its reverse (44031221326612), we get a palindrome (65693533539656).

The spelling of 21662312213044 in words is "twenty-one trillion, six hundred sixty-two billion, three hundred twelve million, two hundred thirteen thousand, forty-four".