212121001211 has 4 divisors (see below), whose sum is σ = 242424001392. Its totient is φ = 181818001032.

The previous prime is 212121001189. The next prime is 212121001219. The reversal of 212121001211 is 112100121212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212121001211 is a prime.

It is a super-3 number, since 3×212121001211³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212121001219) 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, 15151500080 + ... + 15151500093.

It is an arithmetic number, because the mean of its divisors is an integer number (60606000348).

Almost surely, 2^212121001211 is an apocalyptic number.

212121001211 is a deficient number, since it is larger than the sum of its proper divisors (30303000181).

212121001211 is an equidigital number, since it uses as much as digits as its factorization.

212121001211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30303000180.

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

Adding to 212121001211 its reverse (112100121212), we get a palindrome (324221122423).

It can be divided in two parts, 212121001 and 211, that added together give a palindrome (212121212).

The spelling of 212121001211 in words is "two hundred twelve billion, one hundred twenty-one million, one thousand, two hundred eleven".