424272921 has 4 divisors (see below), whose sum is σ = 565697232. Its totient is φ = 282848612.

The previous prime is 424272917. The next prime is 424272923. The reversal of 424272921 is 129272424.

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.

It is a cyclic number.

It is not a de Polignac number, because 424272921 - 2² = 424272917 is a prime.

It is a super-2 number, since 2×424272921² = 360015022987744482, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (424272923) 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 3 ways as a sum of consecutive naturals, for example, 70712151 + ... + 70712156.

It is an arithmetic number, because the mean of its divisors is an integer number (141424308).

Almost surely, 2^424272921 is an apocalyptic number.

It is an amenable number.

424272921 is a deficient number, since it is larger than the sum of its proper divisors (141424311).

424272921 is a wasteful number, since it uses less digits than its factorization.

424272921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141424310.

The product of its digits is 16128, while the sum is 33.

The square root of 424272921 is about 20597.8863236013. The cubic root of 424272921 is about 751.4183064074.

The spelling of 424272921 in words is "four hundred twenty-four million, two hundred seventy-two thousand, nine hundred twenty-one".