11211212122101 has 6 divisors (see below), whose sum is σ = 16193973065270. Its totient is φ = 7474141414728.

The previous prime is 11211212122069. The next prime is 11211212122129. The reversal of 11211212122101 is 10122121211211.

It is a happy number.

11211212122101 is a `hidden beast` number, since 1 + 121 + 121 + 212 + 210 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10311131099025 + 900081023076 = 3211095^2 + 948726^2 .

It is not a de Polignac number, because 11211212122101 - 2⁵ = 11211212122069 is a prime.

It is a super-3 number, since 3×11211212122101³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211212122151) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 622845117886 + ... + 622845117903.

Almost surely, 2^{11211212122101} is an apocalyptic number.

It is an amenable number.

11211212122101 is a deficient number, since it is larger than the sum of its proper divisors (4982760943169).

11211212122101 is a wasteful number, since it uses less digits than its factorization.

11211212122101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245690235795 (or 1245690235792 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 11211212122101 its reverse (10122121211211), we get a palindrome (21333333333312).

The spelling of 11211212122101 in words is "eleven trillion, two hundred eleven billion, two hundred twelve million, one hundred twenty-two thousand, one hundred one".