11212021121 has 8 divisors (see below), whose sum is σ = 12820580160. Its totient is φ = 9605172528.

The previous prime is 11212021109. The next prime is 11212021123. The reversal of 11212021121 is 12112021211.

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

It is not a de Polignac number, because 11212021121 - 2²⁶ = 11144912257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11212021096 and 11212021105.

It is not an unprimeable number, because it can be changed into a prime (11212021123) 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, 413531 + ... + 439808.

It is an arithmetic number, because the mean of its divisors is an integer number (1602572520).

Almost surely, 2^11212021121 is an apocalyptic number.

It is an amenable number.

11212021121 is a deficient number, since it is larger than the sum of its proper divisors (1608559039).

11212021121 is an equidigital number, since it uses as much as digits as its factorization.

11212021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855223.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 11212021121 its reverse (12112021211), we get a palindrome (23324042332).

The spelling of 11212021121 in words is "eleven billion, two hundred twelve million, twenty-one thousand, one hundred twenty-one".