1212121220211 has 48 divisors (see below), whose sum is σ = 1915985560320. Its totient is φ = 732321764160.

The previous prime is 1212121220197. The next prime is 1212121220251. The reversal of 1212121220211 is 1120221212121.

1212121220211 is a `hidden beast` number, since 1 + 21 + 212 + 1 + 220 + 211 = 666.

It is not a de Polignac number, because 1212121220211 - 2⁷ = 1212121220083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212121220251) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 206596900 + ... + 206602766.

It is an arithmetic number, because the mean of its divisors is an integer number (39916365840).

Almost surely, 2^{1212121220211} is an apocalyptic number.

1212121220211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1212121220211 is a deficient number, since it is larger than the sum of its proper divisors (703864340109).

1212121220211 is a wasteful number, since it uses less digits than its factorization.

1212121220211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12056 (or 12053 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1212121220211 its reverse (1120221212121), we get a palindrome (2332342432332).

The spelling of 1212121220211 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twenty thousand, two hundred eleven".