21611723370243 has 8 divisors (see below), whose sum is σ = 28880677733568. Its totient is φ = 14375292293544.

The previous prime is 21611723370197. The next prime is 21611723370257. The reversal of 21611723370243 is 34207332711612.

It is a happy number.

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

It is not a de Polignac number, because 21611723370243 - 2⁸ = 21611723369987 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21611723370195 and 21611723370204.

It is not an unprimeable number, because it can be changed into a prime (21611723370043) 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, 8130820105 + ... + 8130822762.

It is an arithmetic number, because the mean of its divisors is an integer number (3610084716696).

Almost surely, 2^{21611723370243} is an apocalyptic number.

21611723370243 is a deficient number, since it is larger than the sum of its proper divisors (7268954363325).

21611723370243 is a wasteful number, since it uses less digits than its factorization.

21611723370243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16261643313.

The product of its (nonzero) digits is 254016, while the sum is 42.

The spelling of 21611723370243 in words is "twenty-one trillion, six hundred eleven billion, seven hundred twenty-three million, three hundred seventy thousand, two hundred forty-three".