212111021121 has 8 divisors (see below), whose sum is σ = 282818585280. Its totient is φ = 141405402192.

The previous prime is 212111021117. The next prime is 212111021159. The reversal of 212111021121 is 121120111212.

It is a happy number.

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

It is not a de Polignac number, because 212111021121 - 2² = 212111021117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212111021121.

It is not an unprimeable number, because it can be changed into a prime (212111021021) 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, 209341 + ... + 684138.

It is an arithmetic number, because the mean of its divisors is an integer number (35352323160).

Almost surely, 2^212111021121 is an apocalyptic number.

It is an amenable number.

212111021121 is a deficient number, since it is larger than the sum of its proper divisors (70707564159).

212111021121 is an equidigital number, since it uses as much as digits as its factorization.

212111021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972615.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 212111021121 its reverse (121120111212), we get a palindrome (333231132333).

Subtracting from 212111021121 its reverse (121120111212), we obtain a palindrome (90990909909).

The spelling of 212111021121 in words is "two hundred twelve billion, one hundred eleven million, twenty-one thousand, one hundred twenty-one".