126533021 has 4 divisors (see below), whose sum is σ = 127529472. Its totient is φ = 125536572.

The previous prime is 126533009. The next prime is 126533039. The reversal of 126533021 is 120335621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 126533021 - 2¹⁰ = 126531997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126533221) 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 in 3 ways as a sum of consecutive naturals, for example, 498035 + ... + 498288.

It is an arithmetic number, because the mean of its divisors is an integer number (31882368).

Almost surely, 2^126533021 is an apocalyptic number.

It is an amenable number.

126533021 is a deficient number, since it is larger than the sum of its proper divisors (996451).

126533021 is an equidigital number, since it uses as much as digits as its factorization.

126533021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996450.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 126533021 is about 11248.6897459215. The cubic root of 126533021 is about 502.0357283714.

Adding to 126533021 its reverse (120335621), we get a palindrome (246868642).

The spelling of 126533021 in words is "one hundred twenty-six million, five hundred thirty-three thousand, twenty-one".