21798200015 has 32 divisors (see below), whose sum is σ = 28256256000. Its totient is φ = 16089166080.

The previous prime is 21798200009. The next prime is 21798200087. The reversal of 21798200015 is 51000289712.

It is not a de Polignac number, because 21798200015 - 2¹⁸ = 21797937871 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2328434 + ... + 2337776.

It is an arithmetic number, because the mean of its divisors is an integer number (883008000).

Almost surely, 2^21798200015 is an apocalyptic number.

21798200015 is a deficient number, since it is larger than the sum of its proper divisors (6458055985).

21798200015 is a wasteful number, since it uses less digits than its factorization.

21798200015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10007.

The product of its (nonzero) digits is 10080, while the sum is 35.

Adding to 21798200015 its reverse (51000289712), we get a palindrome (72798489727).

The spelling of 21798200015 in words is "twenty-one billion, seven hundred ninety-eight million, two hundred thousand, fifteen".