21220032013 has 2 divisors, whose sum is σ = 21220032014. Its totient is φ = 21220032012.

The previous prime is 21220031999. The next prime is 21220032017. The reversal of 21220032013 is 31023002212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19941111369 + 1278920644 = 141213^2 + 35762^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220032013 - 2⁹ = 21220031501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220032017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610016006 + 10610016007.

It is an arithmetic number, because the mean of its divisors is an integer number (10610016007).

Almost surely, 2^21220032013 is an apocalyptic number.

It is an amenable number.

21220032013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220032013 is an equidigital number, since it uses as much as digits as its factorization.

21220032013 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21220032013 its reverse (31023002212), we get a palindrome (52243034225).

The spelling of 21220032013 in words is "twenty-one billion, two hundred twenty million, thirty-two thousand, thirteen".