211121011201021 has 4 divisors (see below), whose sum is σ = 211122997823772. Its totient is φ = 211119024578272.

The previous prime is 211121011201013. The next prime is 211121011201027. The reversal of 211121011201021 is 120102110121112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 168821011416996 + 42299999784025 = 12993114^2 + 6503845^2 .

It is a cyclic number.

It is not a de Polignac number, because 211121011201021 - 2³ = 211121011201013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211121011200986 and 211121011201004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121011201027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 993151960 + ... + 993364513.

It is an arithmetic number, because the mean of its divisors is an integer number (52780749455943).

Almost surely, 2^{211121011201021} is an apocalyptic number.

It is an amenable number.

211121011201021 is a deficient number, since it is larger than the sum of its proper divisors (1986622751).

211121011201021 is a wasteful number, since it uses less digits than its factorization.

211121011201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986622750.

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

Adding to 211121011201021 its reverse (120102110121112), we get a palindrome (331223121322133).

The spelling of 211121011201021 in words is "two hundred eleven trillion, one hundred twenty-one billion, eleven million, two hundred one thousand, twenty-one".