211121012011 has 32 divisors (see below), whose sum is σ = 267353934848. Its totient is φ = 162254171520.

The previous prime is 211121011951. The next prime is 211121012023. The reversal of 211121012011 is 110210121112.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-211121012011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 211121011982 and 211121012000.

It is not an unprimeable number, because it can be changed into a prime (211121012111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 559210 + ... + 857296.

It is an arithmetic number, because the mean of its divisors is an integer number (8354810464).

Almost surely, 2^211121012011 is an apocalyptic number.

211121012011 is a deficient number, since it is larger than the sum of its proper divisors (56232922837).

211121012011 is a wasteful number, since it uses less digits than its factorization.

211121012011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298331.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 211121012011 its reverse (110210121112), we get a palindrome (321331133123).

The spelling of 211121012011 in words is "two hundred eleven billion, one hundred twenty-one million, twelve thousand, eleven".