125021627821 has 2 divisors, whose sum is σ = 125021627822. Its totient is φ = 125021627820.

The previous prime is 125021627813. The next prime is 125021627897. The reversal of 125021627821 is 128726120521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124856222500 + 165405321 = 353350^2 + 12861^2 .

It is a cyclic number.

It is not a de Polignac number, because 125021627821 - 2³ = 125021627813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125021627921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62510813910 + 62510813911.

It is an arithmetic number, because the mean of its divisors is an integer number (62510813911).

Almost surely, 2^125021627821 is an apocalyptic number.

It is an amenable number.

125021627821 is a deficient number, since it is larger than the sum of its proper divisors (1).

125021627821 is an equidigital number, since it uses as much as digits as its factorization.

125021627821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 37.

The spelling of 125021627821 in words is "one hundred twenty-five billion, twenty-one million, six hundred twenty-seven thousand, eight hundred twenty-one".