126364721 has 4 divisors (see below), whose sum is σ = 144416832. Its totient is φ = 108312612.

The previous prime is 126364709. The next prime is 126364727. The reversal of 126364721 is 127463621.

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 126364721 - 2¹⁸ = 126102577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126364727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9026045 + ... + 9026058.

It is an arithmetic number, because the mean of its divisors is an integer number (36104208).

Almost surely, 2^126364721 is an apocalyptic number.

It is an amenable number.

126364721 is a deficient number, since it is larger than the sum of its proper divisors (18052111).

126364721 is an equidigital number, since it uses as much as digits as its factorization.

126364721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18052110.

The product of its digits is 12096, while the sum is 32.

The square root of 126364721 is about 11241.2063854375. The cubic root of 126364721 is about 501.8130457837.

The spelling of 126364721 in words is "one hundred twenty-six million, three hundred sixty-four thousand, seven hundred twenty-one".