126056821 has 4 divisors (see below), whose sum is σ = 137516544. Its totient is φ = 114597100.

The previous prime is 126056809. The next prime is 126056839. The reversal of 126056821 is 128650621.

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 126056821 - 2⁵ = 126056789 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126054821) 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, 5729845 + ... + 5729866.

It is an arithmetic number, because the mean of its divisors is an integer number (34379136).

Almost surely, 2^126056821 is an apocalyptic number.

126056821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

126056821 is a deficient number, since it is larger than the sum of its proper divisors (11459723).

126056821 is a wasteful number, since it uses less digits than its factorization.

126056821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11459722.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 126056821 is about 11227.5028835445. The cubic root of 126056821 is about 501.4051421188.

It can be divided in two parts, 1260 and 56821, that added together give a square (58081 = 241²).

The spelling of 126056821 in words is "one hundred twenty-six million, fifty-six thousand, eight hundred twenty-one".