125115152021 has 2 divisors, whose sum is σ = 125115152022. Its totient is φ = 125115152020.

The previous prime is 125115152011. The next prime is 125115152051. The reversal of 125115152021 is 120251511521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116519822500 + 8595329521 = 341350^2 + 92711^2 .

It is an emirp because it is prime and its reverse (120251511521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125115152021 - 2¹⁰ = 125115150997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125115152011) 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, 62557576010 + 62557576011.

It is an arithmetic number, because the mean of its divisors is an integer number (62557576011).

Almost surely, 2^125115152021 is an apocalyptic number.

It is an amenable number.

125115152021 is a deficient number, since it is larger than the sum of its proper divisors (1).

125115152021 is an equidigital number, since it uses as much as digits as its factorization.

125115152021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1000, while the sum is 26.

Adding to 125115152021 its reverse (120251511521), we get a palindrome (245366663542).

The spelling of 125115152021 in words is "one hundred twenty-five billion, one hundred fifteen million, one hundred fifty-two thousand, twenty-one".