126568921 has 4 divisors (see below), whose sum is σ = 126842752. Its totient is φ = 126295092.

The previous prime is 126568919. The next prime is 126568969. The reversal of 126568921 is 129865621.

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, and also an emirpimes, since its reverse is a distinct semiprime: 129865621 = 757 ⋅171553.

It is a cyclic number.

It is not a de Polignac number, because 126568921 - 2¹ = 126568919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126568021) 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, 136221 + ... + 137146.

It is an arithmetic number, because the mean of its divisors is an integer number (31710688).

Almost surely, 2^126568921 is an apocalyptic number.

It is an amenable number.

126568921 is a deficient number, since it is larger than the sum of its proper divisors (273831).

126568921 is an equidigital number, since it uses as much as digits as its factorization.

126568921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273830.

The product of its digits is 51840, while the sum is 40.

The square root of 126568921 is about 11250.2853741583. The cubic root of 126568921 is about 502.0832031419.

The spelling of 126568921 in words is "one hundred twenty-six million, five hundred sixty-eight thousand, nine hundred twenty-one".