21367629818 has 8 divisors (see below), whose sum is σ = 32296112640. Its totient is φ = 10602258940.

The previous prime is 21367629781. The next prime is 21367629847. The reversal of 21367629818 is 81892676312.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21367629818.

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, 40777658 + ... + 40778181.

It is an arithmetic number, because the mean of its divisors is an integer number (4037014080).

Almost surely, 2^21367629818 is an apocalyptic number.

21367629818 is a deficient number, since it is larger than the sum of its proper divisors (10928482822).

21367629818 is a wasteful number, since it uses less digits than its factorization.

21367629818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81555972.

The product of its digits is 1741824, while the sum is 53.

The spelling of 21367629818 in words is "twenty-one billion, three hundred sixty-seven million, six hundred twenty-nine thousand, eight hundred eighteen".