125421011 has 2 divisors, whose sum is σ = 125421012. Its totient is φ = 125421010.

The previous prime is 125421007. The next prime is 125421029. The reversal of 125421011 is 110124521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125421011 - 2² = 125421007 is a prime.

It is not a weakly prime, because it can be changed into another prime (125421031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62710505 + 62710506.

It is an arithmetic number, because the mean of its divisors is an integer number (62710506).

Almost surely, 2^125421011 is an apocalyptic number.

125421011 is a deficient number, since it is larger than the sum of its proper divisors (1).

125421011 is an equidigital number, since it uses as much as digits as its factorization.

125421011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 125421011 is about 11199.1522447014. The cubic root of 125421011 is about 500.5607189535.

Adding to 125421011 its reverse (110124521), we get a palindrome (235545532).

The spelling of 125421011 in words is "one hundred twenty-five million, four hundred twenty-one thousand, eleven".