21234230057 has 2 divisors, whose sum is σ = 21234230058. Its totient is φ = 21234230056.

The previous prime is 21234230023. The next prime is 21234230077. The reversal of 21234230057 is 75003243212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15006495001 + 6227735056 = 122501^2 + 78916^2 .

It is a cyclic number.

It is not a de Polignac number, because 21234230057 - 2¹⁶ = 21234164521 is a prime.

It is a super-2 number, since 2×21234230057² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21234230077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617115028 + 10617115029.

It is an arithmetic number, because the mean of its divisors is an integer number (10617115029).

Almost surely, 2^21234230057 is an apocalyptic number.

It is an amenable number.

21234230057 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234230057 is an equidigital number, since it uses as much as digits as its factorization.

21234230057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 29.

Adding to 21234230057 its reverse (75003243212), we get a palindrome (96237473269).

The spelling of 21234230057 in words is "twenty-one billion, two hundred thirty-four million, two hundred thirty thousand, fifty-seven".