21230012201 has 2 divisors, whose sum is σ = 21230012202. Its totient is φ = 21230012200.

The previous prime is 21230012179. The next prime is 21230012249. The reversal of 21230012201 is 10221003212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11449000000 + 9781012201 = 107000^2 + 98899^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230012201 - 2¹⁰ = 21230011177 is a prime.

It is not a weakly prime, because it can be changed into another prime (21230012261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615006100 + 10615006101.

It is an arithmetic number, because the mean of its divisors is an integer number (10615006101).

Almost surely, 2^21230012201 is an apocalyptic number.

It is an amenable number.

21230012201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230012201 is an equidigital number, since it uses as much as digits as its factorization.

21230012201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21230012201 its reverse (10221003212), we get a palindrome (31451015413).

The spelling of 21230012201 in words is "twenty-one billion, two hundred thirty million, twelve thousand, two hundred one".