10211210121209 has 8 divisors (see below), whose sum is σ = 10312457060808. Its totient is φ = 10109966041600.

The previous prime is 10211210121163. The next prime is 10211210121223. The reversal of 10211210121209 is 90212101211201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8109281382400 + 2101928738809 = 2847680^2 + 1449803^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10211210121209 is a prime.

It is a super-2 number, since 2×10211210121209² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10211210121269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6856649 + ... + 8211945.

It is an arithmetic number, because the mean of its divisors is an integer number (1289057132601).

Almost surely, 2^{10211210121209} is an apocalyptic number.

It is an amenable number.

10211210121209 is a deficient number, since it is larger than the sum of its proper divisors (101246939599).

10211210121209 is a wasteful number, since it uses less digits than its factorization.

10211210121209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429995.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 10211210121209 in words is "ten trillion, two hundred eleven billion, two hundred ten million, one hundred twenty-one thousand, two hundred nine".