126806921 has 2 divisors, whose sum is σ = 126806922. Its totient is φ = 126806920.

The previous prime is 126806917. The next prime is 126806959. The reversal of 126806921 is 129608621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126787600 + 19321 = 11260^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 126806921 - 2² = 126806917 is a prime.

It is not a weakly prime, because it can be changed into another prime (126808921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63403460 + 63403461.

It is an arithmetic number, because the mean of its divisors is an integer number (63403461).

Almost surely, 2^126806921 is an apocalyptic number.

It is an amenable number.

126806921 is a deficient number, since it is larger than the sum of its proper divisors (1).

126806921 is an equidigital number, since it uses as much as digits as its factorization.

126806921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 126806921 is about 11260.8579158073. The cubic root of 126806921 is about 502.3977115790.

The spelling of 126806921 in words is "one hundred twenty-six million, eight hundred six thousand, nine hundred twenty-one".