21030221212349 has 2 divisors, whose sum is σ = 21030221212350. Its totient is φ = 21030221212348.

The previous prime is 21030221212321. The next prime is 21030221212433. The reversal of 21030221212349 is 94321212203012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14242268375449 + 6787952836900 = 3773893^2 + 2605370^2 .

It is a cyclic number.

It is not a de Polignac number, because 21030221212349 - 2¹² = 21030221208253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21030221212309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515110606174 + 10515110606175.

It is an arithmetic number, because the mean of its divisors is an integer number (10515110606175).

Almost surely, 2^{21030221212349} is an apocalyptic number.

It is an amenable number.

21030221212349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030221212349 is an equidigital number, since it uses as much as digits as its factorization.

21030221212349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 21030221212349 in words is "twenty-one trillion, thirty billion, two hundred twenty-one million, two hundred twelve thousand, three hundred forty-nine".