21698750206 has 64 divisors (see below), whose sum is σ = 39472468992. Its totient is φ = 8745783552.

The previous prime is 21698750201. The next prime is 21698750273. The reversal of 21698750206 is 60205789612.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21698750201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4717900 + ... + 4722496.

It is an arithmetic number, because the mean of its divisors is an integer number (616757328).

Almost surely, 2^21698750206 is an apocalyptic number.

21698750206 is a deficient number, since it is larger than the sum of its proper divisors (17773718786).

21698750206 is a wasteful number, since it uses less digits than its factorization.

21698750206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4873.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 21698750206 in words is "twenty-one billion, six hundred ninety-eight million, seven hundred fifty thousand, two hundred six".