21021034213 has 2 divisors, whose sum is σ = 21021034214. Its totient is φ = 21021034212.

The previous prime is 21021034189. The next prime is 21021034217. The reversal of 21021034213 is 31243012012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11884924324 + 9136109889 = 109018^2 + 95583^2 .

It is a cyclic number.

It is not a de Polignac number, because 21021034213 - 2¹³ = 21021026021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21021034217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510517106 + 10510517107.

It is an arithmetic number, because the mean of its divisors is an integer number (10510517107).

Almost surely, 2^21021034213 is an apocalyptic number.

It is an amenable number.

21021034213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021034213 is an equidigital number, since it uses as much as digits as its factorization.

21021034213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21021034213 its reverse (31243012012), we get a palindrome (52264046225).

The spelling of 21021034213 in words is "twenty-one billion, twenty-one million, thirty-four thousand, two hundred thirteen".