211121011210021 has 32 divisors (see below), whose sum is σ = 231814309224960. Its totient is φ = 190681648819200.

The previous prime is 211121011210007. The next prime is 211121011210037. The reversal of 211121011210021 is 120012110121112.

It is not a de Polignac number, because 211121011210021 - 2¹¹ = 211121011207973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211121011209977 and 211121011210004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121011210091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15577430781 + ... + 15577444333.

It is an arithmetic number, because the mean of its divisors is an integer number (7244197163280).

Almost surely, 2^{211121011210021} is an apocalyptic number.

It is an amenable number.

211121011210021 is a deficient number, since it is larger than the sum of its proper divisors (20693298014939).

211121011210021 is a wasteful number, since it uses less digits than its factorization.

211121011210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27117.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 211121011210021 its reverse (120012110121112), we get a palindrome (331133121331133).

The spelling of 211121011210021 in words is "two hundred eleven trillion, one hundred twenty-one billion, eleven million, two hundred ten thousand, twenty-one".