26120205621 has 32 divisors (see below), whose sum is σ = 38878519680. Its totient is φ = 17331781248.

The previous prime is 26120205619. The next prime is 26120205677. The reversal of 26120205621 is 12650202162.

26120205621 is a `hidden beast` number, since 2 + 6 + 12 + 0 + 20 + 5 + 621 = 666.

It is not a de Polignac number, because 26120205621 - 2¹ = 26120205619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26120205121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7101835 + ... + 7105511.

It is an arithmetic number, because the mean of its divisors is an integer number (1214953740).

Almost surely, 2^26120205621 is an apocalyptic number.

It is an amenable number.

26120205621 is a deficient number, since it is larger than the sum of its proper divisors (12758314059).

26120205621 is a wasteful number, since it uses less digits than its factorization.

26120205621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4850 (or 4844 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 26120205621 its reverse (12650202162), we get a palindrome (38770407783).

The spelling of 26120205621 in words is "twenty-six billion, one hundred twenty million, two hundred five thousand, six hundred twenty-one".