21230431153 has 2 divisors, whose sum is σ = 21230431154. Its totient is φ = 21230431152.

The previous prime is 21230431097. The next prime is 21230431163. The reversal of 21230431153 is 35113403212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11593474929 + 9636956224 = 107673^2 + 98168^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21230431153 is a prime.

It is not a weakly prime, because it can be changed into another prime (21230431163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615215576 + 10615215577.

It is an arithmetic number, because the mean of its divisors is an integer number (10615215577).

Almost surely, 2^21230431153 is an apocalyptic number.

It is an amenable number.

21230431153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230431153 is an equidigital number, since it uses as much as digits as its factorization.

21230431153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 21230431153 its reverse (35113403212), we get a palindrome (56343834365).

The spelling of 21230431153 in words is "twenty-one billion, two hundred thirty million, four hundred thirty-one thousand, one hundred fifty-three".