126208821 has 4 divisors (see below), whose sum is σ = 168278432. Its totient is φ = 84139212.

The previous prime is 126208807. The next prime is 126208837. The reversal of 126208821 is 128802621.

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 not a de Polignac number, because 126208821 - 2⁶ = 126208757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126208801) 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, 21034801 + ... + 21034806.

It is an arithmetic number, because the mean of its divisors is an integer number (42069608).

Almost surely, 2^126208821 is an apocalyptic number.

It is an amenable number.

126208821 is a deficient number, since it is larger than the sum of its proper divisors (42069611).

126208821 is an equidigital number, since it uses as much as digits as its factorization.

126208821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42069610.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 126208821 is about 11234.2699362264. The cubic root of 126208821 is about 501.6065935187.

The spelling of 126208821 in words is "one hundred twenty-six million, two hundred eight thousand, eight hundred twenty-one".