21611121340206 has 8 divisors (see below), whose sum is σ = 43222242680424. Its totient is φ = 7203707113400.

The previous prime is 21611121340201. The next prime is 21611121340247. The reversal of 21611121340206 is 60204312111612.

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

21611121340206 is an admirable number.

It is a super-2 number, since 2×21611121340206² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21611121340201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1800926778345 + ... + 1800926778356.

It is an arithmetic number, because the mean of its divisors is an integer number (5402780335053).

Almost surely, 2^{21611121340206} is an apocalyptic number.

21611121340206 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21611121340206 is a wasteful number, since it uses less digits than its factorization.

21611121340206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3601853556706.

The product of its (nonzero) digits is 3456, while the sum is 30.

Adding to 21611121340206 its reverse (60204312111612), we get a palindrome (81815433451818).

The spelling of 21611121340206 in words is "twenty-one trillion, six hundred eleven billion, one hundred twenty-one million, three hundred forty thousand, two hundred six".