26040972821 has 2 divisors, whose sum is σ = 26040972822. Its totient is φ = 26040972820.

The previous prime is 26040972809. The next prime is 26040972847. The reversal of 26040972821 is 12827904062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19782422500 + 6258550321 = 140650^2 + 79111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26040972821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26040972851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13020486410 + 13020486411.

It is an arithmetic number, because the mean of its divisors is an integer number (13020486411).

Almost surely, 2^26040972821 is an apocalyptic number.

It is an amenable number.

26040972821 is a deficient number, since it is larger than the sum of its proper divisors (1).

26040972821 is an equidigital number, since it uses as much as digits as its factorization.

26040972821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 41.

The spelling of 26040972821 in words is "twenty-six billion, forty million, nine hundred seventy-two thousand, eight hundred twenty-one".