21162643002641 has 32 divisors (see below), whose sum is σ = 25352905777152. Its totient is φ = 17282564196480.

The previous prime is 21162643002577. The next prime is 21162643002661. The reversal of 21162643002641 is 14620034626112.

It is a cyclic number.

It is not a de Polignac number, because 21162643002641 - 2⁶ = 21162643002577 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21162643002595 and 21162643002604.

It is not an unprimeable number, because it can be changed into a prime (21162643002661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25573925 + ... + 26388461.

It is an arithmetic number, because the mean of its divisors is an integer number (792278305536).

Almost surely, 2^{21162643002641} is an apocalyptic number.

It is an amenable number.

21162643002641 is a deficient number, since it is larger than the sum of its proper divisors (4190262774511).

21162643002641 is a wasteful number, since it uses less digits than its factorization.

21162643002641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816429.

The product of its (nonzero) digits is 82944, while the sum is 38.

Adding to 21162643002641 its reverse (14620034626112), we get a palindrome (35782677628753).

The spelling of 21162643002641 in words is "twenty-one trillion, one hundred sixty-two billion, six hundred forty-three million, two thousand, six hundred forty-one".