21660410034311 has 4 divisors (see below), whose sum is σ = 21798374429592. Its totient is φ = 21522445639032.

The previous prime is 21660410034301. The next prime is 21660410034343. The reversal of 21660410034311 is 11343001406612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21660410034311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21660410034301) 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, 68982197405 + ... + 68982197718.

It is an arithmetic number, because the mean of its divisors is an integer number (5449593607398).

Almost surely, 2^{21660410034311} is an apocalyptic number.

21660410034311 is a deficient number, since it is larger than the sum of its proper divisors (137964395281).

21660410034311 is a wasteful number, since it uses less digits than its factorization.

21660410034311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137964395280.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 21660410034311 in words is "twenty-one trillion, six hundred sixty billion, four hundred ten million, thirty-four thousand, three hundred eleven".