230021561 has 16 divisors (see below), whose sum is σ = 288033408. Its totient is φ = 178454400.

The previous prime is 230021527. The next prime is 230021587. The reversal of 230021561 is 165120032.

It is a cyclic number.

It is not a de Polignac number, because 230021561 - 2¹⁸ = 229759417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (230020561) 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, 11531 + ... + 24351.

It is an arithmetic number, because the mean of its divisors is an integer number (18002088).

Almost surely, 2^230021561 is an apocalyptic number.

It is an amenable number.

230021561 is a deficient number, since it is larger than the sum of its proper divisors (58011847).

230021561 is a wasteful number, since it uses less digits than its factorization.

230021561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13072.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 230021561 is about 15166.4617165640. The cubic root of 230021561 is about 612.7117122354.

Adding to 230021561 its reverse (165120032), we get a palindrome (395141593).

The spelling of 230021561 in words is "two hundred thirty million, twenty-one thousand, five hundred sixty-one".