21113680641 has 8 divisors (see below), whose sum is σ = 28152297984. Its totient is φ = 14075425200.

The previous prime is 21113680639. The next prime is 21113680657. The reversal of 21113680641 is 14608631112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21113680641 - 2¹ = 21113680639 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21113680741) 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, 107616 + ... + 231966.

It is an arithmetic number, because the mean of its divisors is an integer number (3519037248).

Almost surely, 2^21113680641 is an apocalyptic number.

It is an amenable number.

21113680641 is a deficient number, since it is larger than the sum of its proper divisors (7038617343).

21113680641 is a wasteful number, since it uses less digits than its factorization.

21113680641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180951.

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

The spelling of 21113680641 in words is "twenty-one billion, one hundred thirteen million, six hundred eighty thousand, six hundred forty-one".