126571921 has 16 divisors (see below), whose sum is σ = 156153600. Its totient is φ = 100191168.

The previous prime is 126571877. The next prime is 126571957. The reversal of 126571921 is 129175621.

It is not a de Polignac number, because 126571921 - 2¹⁹ = 126047633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126571981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8886 + ... + 18223.

It is an arithmetic number, because the mean of its divisors is an integer number (9759600).

Almost surely, 2^126571921 is an apocalyptic number.

It is an amenable number.

126571921 is a deficient number, since it is larger than the sum of its proper divisors (29581679).

126571921 is a wasteful number, since it uses less digits than its factorization.

126571921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27168.

The product of its digits is 7560, while the sum is 34.

The square root of 126571921 is about 11250.4187033194. The cubic root of 126571921 is about 502.0871699865.

The spelling of 126571921 in words is "one hundred twenty-six million, five hundred seventy-one thousand, nine hundred twenty-one".