26919011221 has 8 divisors (see below), whose sum is σ = 27231908184. Its totient is φ = 26607801600.

The previous prime is 26919011201. The next prime is 26919011257. The reversal of 26919011221 is 12211091962.

It can be written as a sum of positive squares in 4 ways, for example, as 2046567121 + 24872444100 = 45239^2 + 157710^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26919011221 - 2¹³ = 26919003029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26919011201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389730 + ... + 453571.

It is an arithmetic number, because the mean of its divisors is an integer number (3403988523).

Almost surely, 2^26919011221 is an apocalyptic number.

It is an amenable number.

26919011221 is a deficient number, since it is larger than the sum of its proper divisors (312896963).

26919011221 is a wasteful number, since it uses less digits than its factorization.

26919011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843671.

The product of its (nonzero) digits is 3888, while the sum is 34.

The spelling of 26919011221 in words is "twenty-six billion, nine hundred nineteen million, eleven thousand, two hundred twenty-one".