26447269221 has 6 divisors (see below), whose sum is σ = 38201611110. Its totient is φ = 17631512808.

The previous prime is 26447269201. The next prime is 26447269243. The reversal of 26447269221 is 12296274462.

It can be written as a sum of positive squares in only one way, i.e., 24370644321 + 2076624900 = 156111^2 + 45570^2 .

It is not a de Polignac number, because 26447269221 - 2⁶ = 26447269157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26447269201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1469292726 + ... + 1469292743.

It is an arithmetic number, because the mean of its divisors is an integer number (6366935185).

Almost surely, 2^26447269221 is an apocalyptic number.

It is an amenable number.

26447269221 is a deficient number, since it is larger than the sum of its proper divisors (11754341889).

26447269221 is a wasteful number, since it uses less digits than its factorization.

26447269221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2938585475 (or 2938585472 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The spelling of 26447269221 in words is "twenty-six billion, four hundred forty-seven million, two hundred sixty-nine thousand, two hundred twenty-one".