126309921 has 8 divisors (see below), whose sum is σ = 168664704. Its totient is φ = 84080880.

The previous prime is 126309919. The next prime is 126309943. The reversal of 126309921 is 129903621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 126309921 - 2¹ = 126309919 is a prime.

It is a super-3 number, since 3×126309921³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (126309961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29065 + ... + 33126.

It is an arithmetic number, because the mean of its divisors is an integer number (21083088).

Almost surely, 2^126309921 is an apocalyptic number.

It is an amenable number.

126309921 is a deficient number, since it is larger than the sum of its proper divisors (42354783).

126309921 is an equidigital number, since it uses as much as digits as its factorization.

126309921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62871.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 126309921 is about 11238.7686603115. The cubic root of 126309921 is about 501.7404956531.

The spelling of 126309921 in words is "one hundred twenty-six million, three hundred nine thousand, nine hundred twenty-one".