125854360823221 has 2 divisors, whose sum is σ = 125854360823222. Its totient is φ = 125854360823220.

The previous prime is 125854360823173. The next prime is 125854360823291. The reversal of 125854360823221 is 122328063458521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83083480220196 + 42770880603025 = 9115014^2 + 6539945^2 .

It is a cyclic number.

It is not a de Polignac number, because 125854360823221 - 2³⁹ = 125304605009333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125854360823291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62927180411610 + 62927180411611.

It is an arithmetic number, because the mean of its divisors is an integer number (62927180411611).

Almost surely, 2^{125854360823221} is an apocalyptic number.

It is an amenable number.

125854360823221 is a deficient number, since it is larger than the sum of its proper divisors (1).

125854360823221 is an equidigital number, since it uses as much as digits as its factorization.

125854360823221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5529600, while the sum is 52.

The spelling of 125854360823221 in words is "one hundred twenty-five trillion, eight hundred fifty-four billion, three hundred sixty million, eight hundred twenty-three thousand, two hundred twenty-one".