21213010000009 has 2 divisors, whose sum is σ = 21213010000010. Its totient is φ = 21213010000008.

The previous prime is 21213009999997. The next prime is 21213010000057. The reversal of 21213010000009 is 90000001031212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13909655089225 + 7303354910784 = 3729565^2 + 2702472^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213010000009 - 2²⁷ = 21212875782281 is a prime.

It is not a weakly prime, because it can be changed into another prime (21213010700009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606505000004 + 10606505000005.

It is an arithmetic number, because the mean of its divisors is an integer number (10606505000005).

Almost surely, 2^{21213010000009} is an apocalyptic number.

It is an amenable number.

21213010000009 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213010000009 is an equidigital number, since it uses as much as digits as its factorization.

21213010000009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 19.

The spelling of 21213010000009 in words is "twenty-one trillion, two hundred thirteen billion, ten million, nine", and thus it is an aban number.