10661212213 has 2 divisors, whose sum is σ = 10661212214. Its totient is φ = 10661212212.

The previous prime is 10661212183. The next prime is 10661212273. The reversal of 10661212213 is 31221216601.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7986460689 + 2674751524 = 89367^2 + 51718^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10661212213 is a prime.

It is a super-2 number, since 2×10661212213² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10661212273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330606106 + 5330606107.

It is an arithmetic number, because the mean of its divisors is an integer number (5330606107).

Almost surely, 2^10661212213 is an apocalyptic number.

It is an amenable number.

10661212213 is a deficient number, since it is larger than the sum of its proper divisors (1).

10661212213 is an equidigital number, since it uses as much as digits as its factorization.

10661212213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 10661212213 its reverse (31221216601), we get a palindrome (41882428814).

The spelling of 10661212213 in words is "ten billion, six hundred sixty-one million, two hundred twelve thousand, two hundred thirteen".