212121121099 has 4 divisors (see below), whose sum is σ = 212202427320. Its totient is φ = 212039814880.

The previous prime is 212121121067. The next prime is 212121121111. The reversal of 212121121099 is 990121121212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212121121099 - 2⁵ = 212121121067 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212121121099.

It is not an unprimeable number, because it can be changed into a prime (212121521099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40649197 + ... + 40654414.

It is an arithmetic number, because the mean of its divisors is an integer number (53050606830).

Almost surely, 2^212121121099 is an apocalyptic number.

212121121099 is a deficient number, since it is larger than the sum of its proper divisors (81306221).

212121121099 is an equidigital number, since it uses as much as digits as its factorization.

212121121099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81306220.

The product of its (nonzero) digits is 1296, while the sum is 31.

The spelling of 212121121099 in words is "two hundred twelve billion, one hundred twenty-one million, one hundred twenty-one thousand, ninety-nine".