21641035115 has 16 divisors (see below), whose sum is σ = 29690532288. Its totient is φ = 14833867776.

The previous prime is 21641035099. The next prime is 21641035121. The reversal of 21641035115 is 51153014612.

It is not a de Polignac number, because 21641035115 - 2⁴ = 21641035099 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25262 + ... + 209571.

It is an arithmetic number, because the mean of its divisors is an integer number (1855658268).

Almost surely, 2^21641035115 is an apocalyptic number.

21641035115 is a deficient number, since it is larger than the sum of its proper divisors (8049497173).

21641035115 is a wasteful number, since it uses less digits than its factorization.

21641035115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237478.

The product of its (nonzero) digits is 3600, while the sum is 29.

Adding to 21641035115 its reverse (51153014612), we get a palindrome (72794049727).

The spelling of 21641035115 in words is "twenty-one billion, six hundred forty-one million, thirty-five thousand, one hundred fifteen".