21611170242266 has 24 divisors (see below), whose sum is σ = 36500704604532. Its totient is φ = 9583667508800.

The previous prime is 21611170242203. The next prime is 21611170242281. The reversal of 21611170242266 is 66224207111612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21580345066225 + 30825176041 = 4645465^2 + 175571^2 .

It is a super-2 number, since 2×21611170242266² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1089043205 + ... + 1089063048.

Almost surely, 2^{21611170242266} is an apocalyptic number.

21611170242266 is a deficient number, since it is larger than the sum of its proper divisors (14889534362266).

21611170242266 is a wasteful number, since it uses less digits than its factorization.

21611170242266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2178106318 (or 2178106307 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

Adding to 21611170242266 its reverse (66224207111612), we get a palindrome (87835377353878).

The spelling of 21611170242266 in words is "twenty-one trillion, six hundred eleven billion, one hundred seventy million, two hundred forty-two thousand, two hundred sixty-six".