26612205221 has 48 divisors (see below), whose sum is σ = 32464281600. Its totient is φ = 21723787008.

The previous prime is 26612205143. The next prime is 26612205247. The reversal of 26612205221 is 12250221662.

It is a de Polignac number, because none of the positive numbers 2^k-26612205221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26612205271) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 43131305 + ... + 43131921.

It is an arithmetic number, because the mean of its divisors is an integer number (676339200).

Almost surely, 2^26612205221 is an apocalyptic number.

It is an amenable number.

26612205221 is a deficient number, since it is larger than the sum of its proper divisors (5852076379).

26612205221 is a wasteful number, since it uses less digits than its factorization.

26612205221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026 (or 1019 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 26612205221 its reverse (12250221662), we get a palindrome (38862426883).

The spelling of 26612205221 in words is "twenty-six billion, six hundred twelve million, two hundred five thousand, two hundred twenty-one".