230153721 has 16 divisors (see below), whose sum is σ = 352497024. Its totient is φ = 130846464.

The previous prime is 230153717. The next prime is 230153731. The reversal of 230153721 is 127351032.

It is not a de Polignac number, because 230153721 - 2² = 230153717 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 230153691 and 230153700.

It is not an unprimeable number, because it can be changed into a prime (230153731) 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, 23680 + ... + 31953.

It is an arithmetic number, because the mean of its divisors is an integer number (22031064).

Almost surely, 2^230153721 is an apocalyptic number.

230153721 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

230153721 is a deficient number, since it is larger than the sum of its proper divisors (122343303).

230153721 is a wasteful number, since it uses less digits than its factorization.

230153721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55840.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 230153721 is about 15170.8180728661. The cubic root of 230153721 is about 612.8290352610.

The spelling of 230153721 in words is "two hundred thirty million, one hundred fifty-three thousand, seven hundred twenty-one".