21545412386 has 8 divisors (see below), whose sum is σ = 33069702864. Its totient is φ = 10522178100.

The previous prime is 21545412359. The next prime is 21545412419. The reversal of 21545412386 is 68321454512.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125263940 + ... + 125264111.

It is an arithmetic number, because the mean of its divisors is an integer number (4133712858).

Almost surely, 2^21545412386 is an apocalyptic number.

21545412386 is a deficient number, since it is larger than the sum of its proper divisors (11524290478).

21545412386 is a wasteful number, since it uses less digits than its factorization.

21545412386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250528096.

The product of its digits is 230400, while the sum is 41.

Adding to 21545412386 its reverse (68321454512), we get a palindrome (89866866898).

The spelling of 21545412386 in words is "twenty-one billion, five hundred forty-five million, four hundred twelve thousand, three hundred eighty-six".