125026019821 has 2 divisors, whose sum is σ = 125026019822. Its totient is φ = 125026019820.

The previous prime is 125026019791. The next prime is 125026019831. The reversal of 125026019821 is 128910620521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122927372100 + 2098647721 = 350610^2 + 45811^2 .

It is a cyclic number.

It is not a de Polignac number, because 125026019821 - 2²⁹ = 124489148909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125026019831) 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, 62513009910 + 62513009911.

It is an arithmetic number, because the mean of its divisors is an integer number (62513009911).

Almost surely, 2^125026019821 is an apocalyptic number.

It is an amenable number.

125026019821 is a deficient number, since it is larger than the sum of its proper divisors (1).

125026019821 is an equidigital number, since it uses as much as digits as its factorization.

125026019821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 37.

The spelling of 125026019821 in words is "one hundred twenty-five billion, twenty-six million, nineteen thousand, eight hundred twenty-one".