21611245531271 has 16 divisors (see below), whose sum is σ = 23702811360000. Its totient is φ = 19540871723520.

The previous prime is 21611245531243. The next prime is 21611245531273. The reversal of 21611245531271 is 17213554211612.

It is a cyclic number.

It is not a de Polignac number, because 21611245531271 - 2²² = 21611241336967 is a prime.

It is a super-3 number, since 3×21611245531271³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21611245531273) 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 15 ways as a sum of consecutive naturals, for example, 9594716 + ... + 11631038.

It is an arithmetic number, because the mean of its divisors is an integer number (1481425710000).

Almost surely, 2^{21611245531271} is an apocalyptic number.

21611245531271 is a deficient number, since it is larger than the sum of its proper divisors (2091565828729).

21611245531271 is a wasteful number, since it uses less digits than its factorization.

21611245531271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2041526.

The product of its digits is 100800, while the sum is 41.

Adding to 21611245531271 its reverse (17213554211612), we get a palindrome (38824799742883).

The spelling of 21611245531271 in words is "twenty-one trillion, six hundred eleven billion, two hundred forty-five million, five hundred thirty-one thousand, two hundred seventy-one".