21206101611 has 8 divisors (see below), whose sum is σ = 28276096464. Its totient is φ = 14136753920.

The previous prime is 21206101603. The next prime is 21206101613. The reversal of 21206101611 is 11610160212.

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 21206101611 - 2³ = 21206101603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21206101613) 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, 79326 + ... + 220691.

It is an arithmetic number, because the mean of its divisors is an integer number (3534512058).

Almost surely, 2^21206101611 is an apocalyptic number.

21206101611 is a deficient number, since it is larger than the sum of its proper divisors (7069994853).

21206101611 is a wasteful number, since it uses less digits than its factorization.

21206101611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323581.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 21206101611 its reverse (11610160212), we get a palindrome (32816261823).

The spelling of 21206101611 in words is "twenty-one billion, two hundred six million, one hundred one thousand, six hundred eleven".