2121221202111 has 12 divisors (see below), whose sum is σ = 3342530379240. Its totient is φ = 1285588607280.

The previous prime is 2121221202103. The next prime is 2121221202119. The reversal of 2121221202111 is 1112021221212.

2121221202111 is a `hidden beast` number, since 212 + 1 + 221 + 20 + 211 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (2121221202103) and next prime (2121221202119).

It is not a de Polignac number, because 2121221202111 - 2³ = 2121221202103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121221202119) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10713238296 + ... + 10713238493.

It is an arithmetic number, because the mean of its divisors is an integer number (278544198270).

Almost surely, 2^{2121221202111} is an apocalyptic number.

2121221202111 is a deficient number, since it is larger than the sum of its proper divisors (1221309177129).

2121221202111 is a wasteful number, since it uses less digits than its factorization.

2121221202111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21426476806 (or 21426476803 counting only the distinct ones).

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

Adding to 2121221202111 its reverse (1112021221212), we get a palindrome (3233242423323).

The spelling of 2121221202111 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred two thousand, one hundred eleven".