21240186486691 has 8 divisors (see below), whose sum is σ = 22120073874000. Its totient is φ = 20370130243680.

The previous prime is 21240186486677. The next prime is 21240186486709. The reversal of 21240186486691 is 19668468104212.

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

It is a cyclic number.

It is not a de Polignac number, because 21240186486691 - 2¹⁵ = 21240186453923 is a prime.

It is a super-2 number, since 2×21240186486691² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21240186486611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2457781665 + ... + 2457790306.

It is an arithmetic number, because the mean of its divisors is an integer number (2765009234250).

Almost surely, 2^{21240186486691} is an apocalyptic number.

21240186486691 is a deficient number, since it is larger than the sum of its proper divisors (879887387309).

21240186486691 is a wasteful number, since it uses less digits than its factorization.

21240186486691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4915572149.

The product of its (nonzero) digits is 7962624, while the sum is 58.

The spelling of 21240186486691 in words is "twenty-one trillion, two hundred forty billion, one hundred eighty-six million, four hundred eighty-six thousand, six hundred ninety-one".