126521011 has 4 divisors (see below), whose sum is σ = 126567000. Its totient is φ = 126475024.

The previous prime is 126521009. The next prime is 126521027. The reversal of 126521011 is 110125621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 126521011 - 2¹ = 126521009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126521011.

It is not an unprimeable number, because it can be changed into a prime (126521071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18586 + ... + 24463.

It is an arithmetic number, because the mean of its divisors is an integer number (31641750).

Almost surely, 2^126521011 is an apocalyptic number.

126521011 is a deficient number, since it is larger than the sum of its proper divisors (45989).

126521011 is an equidigital number, since it uses as much as digits as its factorization.

126521011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45988.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 126521011 is about 11248.1558933009. The cubic root of 126521011 is about 502.0198441386.

Adding to 126521011 its reverse (110125621), we get a palindrome (236646632).

The spelling of 126521011 in words is "one hundred twenty-six million, five hundred twenty-one thousand, eleven".