21000202213 has 2 divisors, whose sum is σ = 21000202214. Its totient is φ = 21000202212.

The previous prime is 21000202169. The next prime is 21000202241. The reversal of 21000202213 is 31220200012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14292919809 + 6707282404 = 119553^2 + 81898^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000202213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21000202193 and 21000202202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000202253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500101106 + 10500101107.

It is an arithmetic number, because the mean of its divisors is an integer number (10500101107).

Almost surely, 2^21000202213 is an apocalyptic number.

It is an amenable number.

21000202213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000202213 is an equidigital number, since it uses as much as digits as its factorization.

21000202213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21000202213 its reverse (31220200012), we get a palindrome (52220402225).

The spelling of 21000202213 in words is "twenty-one billion, two hundred two thousand, two hundred thirteen".