21115344425464 has 128 divisors (see below), whose sum is σ = 42281008560000. Its totient is φ = 9866877511680.

The previous prime is 21115344425459. The next prime is 21115344425503. The reversal of 21115344425464 is 46452444351112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2970223542 + ... + 2970230650.

It is an arithmetic number, because the mean of its divisors is an integer number (330320379375).

Almost surely, 2^{21115344425464} is an apocalyptic number.

It is an amenable number.

21115344425464 is an abundant number, since it is smaller than the sum of its proper divisors (21165664134536).

21115344425464 is a wasteful number, since it uses less digits than its factorization.

21115344425464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8921 (or 8917 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 46.

Adding to 21115344425464 its reverse (46452444351112), we get a palindrome (67567788776576).

The spelling of 21115344425464 in words is "twenty-one trillion, one hundred fifteen billion, three hundred forty-four million, four hundred twenty-five thousand, four hundred sixty-four".