21611723370241 has 4 divisors (see below), whose sum is σ = 21625515154432. Its totient is φ = 21597931586052.

The previous prime is 21611723370197. The next prime is 21611723370257. The reversal of 21611723370241 is 14207332711612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21611723370241 is a prime.

It is a super-3 number, since 3×21611723370241³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21611723370194 and 21611723370203.

It is not an unprimeable number, because it can be changed into a prime (21611723370271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6895889745 + ... + 6895892878.

It is an arithmetic number, because the mean of its divisors is an integer number (5406378788608).

Almost surely, 2^{21611723370241} is an apocalyptic number.

It is an amenable number.

21611723370241 is a deficient number, since it is larger than the sum of its proper divisors (13791784191).

21611723370241 is a wasteful number, since it uses less digits than its factorization.

21611723370241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13791784190.

The product of its (nonzero) digits is 84672, while the sum is 40.

The spelling of 21611723370241 in words is "twenty-one trillion, six hundred eleven billion, seven hundred twenty-three million, three hundred seventy thousand, two hundred forty-one".