26187456821 has 2 divisors, whose sum is σ = 26187456822. Its totient is φ = 26187456820.

The previous prime is 26187456803. The next prime is 26187456839. The reversal of 26187456821 is 12865478162.

It is a balanced prime because it is at equal distance from previous prime (26187456803) and next prime (26187456839).

It can be written as a sum of positive squares in only one way, i.e., 19290154321 + 6897302500 = 138889^2 + 83050^2 .

It is a cyclic number.

It is not a de Polignac number, because 26187456821 - 2³⁴ = 9007587637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26187456821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26187456871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13093728410 + 13093728411.

It is an arithmetic number, because the mean of its divisors is an integer number (13093728411).

Almost surely, 2^26187456821 is an apocalyptic number.

It is an amenable number.

26187456821 is a deficient number, since it is larger than the sum of its proper divisors (1).

26187456821 is an equidigital number, since it uses as much as digits as its factorization.

26187456821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 50.

The spelling of 26187456821 in words is "twenty-six billion, one hundred eighty-seven million, four hundred fifty-six thousand, eight hundred twenty-one".