21241610641 has 4 divisors (see below), whose sum is σ = 21601638000. Its totient is φ = 20881583284.

The previous prime is 21241610639. The next prime is 21241610651. The reversal of 21241610641 is 14601614212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21241610641 - 2¹ = 21241610639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21241610651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180013591 + ... + 180013708.

It is an arithmetic number, because the mean of its divisors is an integer number (5400409500).

Almost surely, 2^21241610641 is an apocalyptic number.

It is an amenable number.

21241610641 is a deficient number, since it is larger than the sum of its proper divisors (360027359).

21241610641 is an equidigital number, since it uses as much as digits as its factorization.

21241610641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360027358.

The product of its (nonzero) digits is 2304, while the sum is 28.

The spelling of 21241610641 in words is "twenty-one billion, two hundred forty-one million, six hundred ten thousand, six hundred forty-one".