126606321 has 10 divisors (see below), whose sum is σ = 189128082. Its totient is φ = 84404160.

The previous prime is 126606317. The next prime is 126606331. The reversal of 126606321 is 123606621.

126606321 is a `hidden beast` number, since 1 + 26 + 6 + 0 + 632 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 81649296 + 44957025 = 9036^2 + 6705^2 .

It is not a de Polignac number, because 126606321 - 2² = 126606317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (126606301) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 781440 + ... + 781601.

Almost surely, 2^126606321 is an apocalyptic number.

It is an amenable number.

126606321 is a deficient number, since it is larger than the sum of its proper divisors (62521761).

126606321 is an equidigital number, since it uses as much as digits as its factorization.

126606321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563053 (or 1563044 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 126606321 is about 11251.9474314449. The cubic root of 126606321 is about 502.1326519913.

It can be divided in two parts, 12660 and 6321, that added together give a palindrome (18981).

The spelling of 126606321 in words is "one hundred twenty-six million, six hundred six thousand, three hundred twenty-one".