21611177441345 has 8 divisors (see below), whose sum is σ = 25935591730176. Its totient is φ = 17287489419376.

The previous prime is 21611177441137. The next prime is 21611177441387. The reversal of 21611177441345 is 54314477111612.

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 21611177441345 - 2⁸ = 21611177441089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21611177441345.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181501247 + ... + 181620276.

It is an arithmetic number, because the mean of its divisors is an integer number (3241948966272).

Almost surely, 2^{21611177441345} is an apocalyptic number.

It is an amenable number.

21611177441345 is a deficient number, since it is larger than the sum of its proper divisors (4324414288831).

21611177441345 is a wasteful number, since it uses less digits than its factorization.

21611177441345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363133431.

The product of its digits is 564480, while the sum is 47.

The spelling of 21611177441345 in words is "twenty-one trillion, six hundred eleven billion, one hundred seventy-seven million, four hundred forty-one thousand, three hundred forty-five".