21768213452 has 12 divisors (see below), whose sum is σ = 38522400840. Its totient is φ = 10761813216.

The previous prime is 21768213451. The next prime is 21768213463. The reversal of 21768213452 is 25431286712.

It is not an unprimeable number, because it can be changed into a prime (21768213451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30572978 + ... + 30573689.

It is an arithmetic number, because the mean of its divisors is an integer number (3210200070).

Almost surely, 2^21768213452 is an apocalyptic number.

It is an amenable number.

21768213452 is a deficient number, since it is larger than the sum of its proper divisors (16754187388).

21768213452 is a wasteful number, since it uses less digits than its factorization.

21768213452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61146760 (or 61146758 counting only the distinct ones).

The product of its digits is 161280, while the sum is 41.

The spelling of 21768213452 in words is "twenty-one billion, seven hundred sixty-eight million, two hundred thirteen thousand, four hundred fifty-two".