21984251342 has 16 divisors (see below), whose sum is σ = 33023178240. Its totient is φ = 10976539392.

The previous prime is 21984251329. The next prime is 21984251347. The reversal of 21984251342 is 24315248912.

It is a self number, because there is not a number n which added to its sum of digits gives 21984251342.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21984251347) 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, 6227834 + ... + 6231362.

It is an arithmetic number, because the mean of its divisors is an integer number (2063948640).

Almost surely, 2^21984251342 is an apocalyptic number.

21984251342 is a deficient number, since it is larger than the sum of its proper divisors (11038926898).

21984251342 is a wasteful number, since it uses less digits than its factorization.

21984251342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7067.

The product of its digits is 138240, while the sum is 41.

The spelling of 21984251342 in words is "twenty-one billion, nine hundred eighty-four million, two hundred fifty-one thousand, three hundred forty-two".