21641614611 has 16 divisors (see below), whose sum is σ = 29641079808. Its totient is φ = 14035096800.

The previous prime is 21641614597. The next prime is 21641614627. The reversal of 21641614611 is 11641614612.

It is not a de Polignac number, because 21641614611 - 2¹¹ = 21641612563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21641614661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 673726 + ... + 705116.

It is an arithmetic number, because the mean of its divisors is an integer number (1852567488).

Almost surely, 2^21641614611 is an apocalyptic number.

21641614611 is a deficient number, since it is larger than the sum of its proper divisors (7999465197).

21641614611 is a wasteful number, since it uses less digits than its factorization.

21641614611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37642.

The product of its digits is 6912, while the sum is 33.

Subtracting from 21641614611 its reverse (11641614612), we obtain a palindrome (9999999999).

The spelling of 21641614611 in words is "twenty-one billion, six hundred forty-one million, six hundred fourteen thousand, six hundred eleven".