21698409722 has 16 divisors (see below), whose sum is σ = 36466124832. Its totient is φ = 9596347920.

The previous prime is 21698409703. The next prime is 21698409727. The reversal of 21698409722 is 22790489612.

It is not an unprimeable number, because it can be changed into a prime (21698409727) 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 7 ways as a sum of consecutive naturals, for example, 13327448 + ... + 13329075.

It is an arithmetic number, because the mean of its divisors is an integer number (2279132802).

Almost surely, 2^21698409722 is an apocalyptic number.

21698409722 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21698409722 is a deficient number, since it is larger than the sum of its proper divisors (14767715110).

21698409722 is a wasteful number, since it uses less digits than its factorization.

21698409722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26656573.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 21698409722 in words is "twenty-one billion, six hundred ninety-eight million, four hundred nine thousand, seven hundred twenty-two".