21230102201257 has 2 divisors, whose sum is σ = 21230102201258. Its totient is φ = 21230102201256.

The previous prime is 21230102201153. The next prime is 21230102201263. The reversal of 21230102201257 is 75210220103212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14658821171856 + 6571281029401 = 3828684^2 + 2563451^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21230102201257 is a prime.

It is not a weakly prime, because it can be changed into another prime (21230102208257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615051100628 + 10615051100629.

It is an arithmetic number, because the mean of its divisors is an integer number (10615051100629).

Almost surely, 2^{21230102201257} is an apocalyptic number.

It is an amenable number.

21230102201257 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230102201257 is an equidigital number, since it uses as much as digits as its factorization.

21230102201257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 28.

Adding to 21230102201257 its reverse (75210220103212), we get a palindrome (96440322304469).

The spelling of 21230102201257 in words is "twenty-one trillion, two hundred thirty billion, one hundred two million, two hundred one thousand, two hundred fifty-seven".