211001111210121 has 24 divisors (see below), whose sum is σ = 290970323983872. Its totient is φ = 136004512788000.

The previous prime is 211001111210107. The next prime is 211001111210137. The reversal of 211001111210121 is 121012111100112.

It is not a de Polignac number, because 211001111210121 - 2¹³ = 211001111201929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211001111210121.

It is not an unprimeable number, because it can be changed into a prime (211001112210121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30531330 + ... + 36798971.

It is an arithmetic number, because the mean of its divisors is an integer number (12123763499328).

Almost surely, 2^{211001111210121} is an apocalyptic number.

It is an amenable number.

211001111210121 is a deficient number, since it is larger than the sum of its proper divisors (79969212773751).

211001111210121 is a wasteful number, since it uses less digits than its factorization.

211001111210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67331453 (or 67331422 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 211001111210121 its reverse (121012111100112), we get a palindrome (332013222310233).

The spelling of 211001111210121 in words is "two hundred eleven trillion, one billion, one hundred eleven million, two hundred ten thousand, one hundred twenty-one".