234429155721 has 32 divisors (see below), whose sum is σ = 348446448000. Its totient is φ = 155771725824.

The previous prime is 234429155713. The next prime is 234429155731. The reversal of 234429155721 is 127551924432.

234429155721 is a `hidden beast` number, since 2 + 3 + 4 + 4 + 2 + 91 + 557 + 2 + 1 = 666.

It is not a de Polignac number, because 234429155721 - 2³ = 234429155713 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (234429155731) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28007425 + ... + 28015793.

It is an arithmetic number, because the mean of its divisors is an integer number (10888951500).

Almost surely, 2^234429155721 is an apocalyptic number.

It is an amenable number.

234429155721 is a deficient number, since it is larger than the sum of its proper divisors (114017292279).

234429155721 is a wasteful number, since it uses less digits than its factorization.

234429155721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11670 (or 11664 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The spelling of 234429155721 in words is "two hundred thirty-four billion, four hundred twenty-nine million, one hundred fifty-five thousand, seven hundred twenty-one".