21441083778581 has 8 divisors (see below), whose sum is σ = 21628866150528. Its totient is φ = 21254063202000.

The previous prime is 21441083778577. The next prime is 21441083778649. The reversal of 21441083778581 is 18587738014412.

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 21441083778581 - 2² = 21441083778577 is a prime.

It is a super-2 number, since 2×21441083778581² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21441083778581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441083778281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190392305 + ... + 190504886.

It is an arithmetic number, because the mean of its divisors is an integer number (2703608268816).

Almost surely, 2^{21441083778581} is an apocalyptic number.

It is an amenable number.

21441083778581 is a deficient number, since it is larger than the sum of its proper divisors (187782371947).

21441083778581 is a wasteful number, since it uses less digits than its factorization.

21441083778581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380897683.

The product of its (nonzero) digits is 12042240, while the sum is 59.

The spelling of 21441083778581 in words is "twenty-one trillion, four hundred forty-one billion, eighty-three million, seven hundred seventy-eight thousand, five hundred eighty-one".