26420125621 has 2 divisors, whose sum is σ = 26420125622. Its totient is φ = 26420125620.

The previous prime is 26420125607. The next prime is 26420125643. The reversal of 26420125621 is 12652102462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20768844996 + 5651280625 = 144114^2 + 75175^2 .

It is a cyclic number.

It is not a de Polignac number, because 26420125621 - 2¹⁹ = 26419601333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26420125681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13210062810 + 13210062811.

It is an arithmetic number, because the mean of its divisors is an integer number (13210062811).

Almost surely, 2^26420125621 is an apocalyptic number.

It is an amenable number.

26420125621 is a deficient number, since it is larger than the sum of its proper divisors (1).

26420125621 is an equidigital number, since it uses as much as digits as its factorization.

26420125621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 26420125621 in words is "twenty-six billion, four hundred twenty million, one hundred twenty-five thousand, six hundred twenty-one".