211001213121 has 16 divisors (see below), whose sum is σ = 287240614080. Its totient is φ = 137742370560.

The previous prime is 211001213117. The next prime is 211001213177. The reversal of 211001213121 is 121312100112.

It is not a de Polignac number, because 211001213121 - 2² = 211001213117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211001213121.

It is not an unprimeable number, because it can be changed into a prime (211001213221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3435300 + ... + 3496181.

It is an arithmetic number, because the mean of its divisors is an integer number (17952538380).

Almost surely, 2^211001213121 is an apocalyptic number.

It is an amenable number.

211001213121 is a deficient number, since it is larger than the sum of its proper divisors (76239400959).

211001213121 is a wasteful number, since it uses less digits than its factorization.

211001213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6931696.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 211001213121 its reverse (121312100112), we get a palindrome (332313313233).

The spelling of 211001213121 in words is "two hundred eleven billion, one million, two hundred thirteen thousand, one hundred twenty-one".