234218721 has 16 divisors (see below), whose sum is σ = 348606720. Its totient is φ = 138648720.

The previous prime is 234218701. The next prime is 234218737. The reversal of 234218721 is 127812432.

It is not a de Polignac number, because 234218721 - 2⁶ = 234218657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (234218701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81111 + ... + 83948.

It is an arithmetic number, because the mean of its divisors is an integer number (21787920).

Almost surely, 2^234218721 is an apocalyptic number.

It is an amenable number.

234218721 is a deficient number, since it is larger than the sum of its proper divisors (114387999).

234218721 is a wasteful number, since it uses less digits than its factorization.

234218721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165116.

The product of its digits is 5376, while the sum is 30.

The square root of 234218721 is about 15304.2059905112. The cubic root of 234218721 is about 616.4159509017.

The spelling of 234218721 in words is "two hundred thirty-four million, two hundred eighteen thousand, seven hundred twenty-one".