21872140731366 has 8 divisors (see below), whose sum is σ = 43744281462744. Its totient is φ = 7290713577120.

The previous prime is 21872140731347. The next prime is 21872140731367. The reversal of 21872140731366 is 66313704127812.

It is a sphenic number, since it is the product of 3 distinct primes.

21872140731366 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21872140731367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1822678394275 + ... + 1822678394286.

It is an arithmetic number, because the mean of its divisors is an integer number (5468035182843).

Almost surely, 2^{21872140731366} is an apocalyptic number.

21872140731366 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21872140731366 is a wasteful number, since it uses less digits than its factorization.

21872140731366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3645356788566.

The product of its (nonzero) digits is 2032128, while the sum is 51.

The spelling of 21872140731366 in words is "twenty-one trillion, eight hundred seventy-two billion, one hundred forty million, seven hundred thirty-one thousand, three hundred sixty-six".