21581083722241 has 8 divisors (see below), whose sum is σ = 22850629908480. Its totient is φ = 20311545388608.

The previous prime is 21581083722239. The next prime is 21581083722269. The reversal of 21581083722241 is 14222738018512.

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 21581083722241 - 2¹ = 21581083722239 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21581083722191 and 21581083722200.

It is not an unprimeable number, because it can be changed into a prime (21581083722941) 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, 4258440 + ... + 7829206.

It is an arithmetic number, because the mean of its divisors is an integer number (2856328738560).

Almost surely, 2^{21581083722241} is an apocalyptic number.

It is an amenable number.

21581083722241 is a deficient number, since it is larger than the sum of its proper divisors (1269546186239).

21581083722241 is a wasteful number, since it uses less digits than its factorization.

21581083722241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3926303.

The product of its (nonzero) digits is 430080, while the sum is 46.

The spelling of 21581083722241 in words is "twenty-one trillion, five hundred eighty-one billion, eighty-three million, seven hundred twenty-two thousand, two hundred forty-one".