21223030201 has 4 divisors (see below), whose sum is σ = 21262260004. Its totient is φ = 21183800400.

The previous prime is 21223030141. The next prime is 21223030223. The reversal of 21223030201 is 10203032212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13059004176 + 8164026025 = 114276^2 + 90355^2 .

It is a cyclic number.

It is not a de Polignac number, because 21223030201 - 2²⁷ = 21088812473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21223030261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19614090 + ... + 19615171.

It is an arithmetic number, because the mean of its divisors is an integer number (5315565001).

Almost surely, 2^21223030201 is an apocalyptic number.

It is an amenable number.

21223030201 is a deficient number, since it is larger than the sum of its proper divisors (39229803).

21223030201 is an equidigital number, since it uses as much as digits as its factorization.

21223030201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39229802.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21223030201 its reverse (10203032212), we get a palindrome (31426062413).

The spelling of 21223030201 in words is "twenty-one billion, two hundred twenty-three million, thirty thousand, two hundred one".