21221130253 has 2 divisors, whose sum is σ = 21221130254. Its totient is φ = 21221130252.

The previous prime is 21221130221. The next prime is 21221130313. The reversal of 21221130253 is 35203112212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13403387529 + 7817742724 = 115773^2 + 88418^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221130253 - 2⁵ = 21221130221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221130053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610565126 + 10610565127.

It is an arithmetic number, because the mean of its divisors is an integer number (10610565127).

Almost surely, 2^21221130253 is an apocalyptic number.

It is an amenable number.

21221130253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221130253 is an equidigital number, since it uses as much as digits as its factorization.

21221130253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21221130253 its reverse (35203112212), we get a palindrome (56424242465).

The spelling of 21221130253 in words is "twenty-one billion, two hundred twenty-one million, one hundred thirty thousand, two hundred fifty-three".