211121020102021 has 4 divisors (see below), whose sum is σ = 223539903637452. Its totient is φ = 198702136566592.

The previous prime is 211121020102007. The next prime is 211121020102037. The reversal of 211121020102021 is 120201020121112.

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 148232329504900 + 62888690597121 = 12175070^2 + 7930239^2 .

It is a cyclic number.

It is not a de Polignac number, because 211121020102021 - 2¹³ = 211121020093829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211121020101986 and 211121020102004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121020102621) 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, 6209441767690 + ... + 6209441767723.

It is an arithmetic number, because the mean of its divisors is an integer number (55884975909363).

Almost surely, 2^{211121020102021} is an apocalyptic number.

It is an amenable number.

211121020102021 is a deficient number, since it is larger than the sum of its proper divisors (12418883535431).

211121020102021 is a wasteful number, since it uses less digits than its factorization.

211121020102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12418883535430.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211121020102021 its reverse (120201020121112), we get a palindrome (331322040223133).

The spelling of 211121020102021 in words is "two hundred eleven trillion, one hundred twenty-one billion, twenty million, one hundred two thousand, twenty-one".