21951968984718 has 32 divisors (see below), whose sum is σ = 44076061418400. Its totient is φ = 7288684256256.

The previous prime is 21951968984713. The next prime is 21951968984741. The reversal of 21951968984718 is 81748986915912.

It is a super-3 number, since 3×21951968984718³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21951968984713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4251723 + ... + 7872806.

It is an arithmetic number, because the mean of its divisors is an integer number (1377376919325).

Almost surely, 2^{21951968984718} is an apocalyptic number.

21951968984718 is an abundant number, since it is smaller than the sum of its proper divisors (22124092433682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21951968984718 is a wasteful number, since it uses less digits than its factorization.

21951968984718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12125716.

The product of its digits is 627056640, while the sum is 78.

The spelling of 21951968984718 in words is "twenty-one trillion, nine hundred fifty-one billion, nine hundred sixty-eight million, nine hundred eighty-four thousand, seven hundred eighteen".