211020121021 has 8 divisors (see below), whose sum is σ = 222130666080. Its totient is φ = 199909998288.

The previous prime is 211020121009. The next prime is 211020121043. The reversal of 211020121021 is 120121020112.

211020121021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211020121021 - 2¹³ = 211020112829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211020120992 and 211020121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211020121121) 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 7 ways as a sum of consecutive naturals, for example, 1831110 + ... + 1942936.

It is an arithmetic number, because the mean of its divisors is an integer number (27766333260).

Almost surely, 2^211020121021 is an apocalyptic number.

It is an amenable number.

211020121021 is a deficient number, since it is larger than the sum of its proper divisors (11110545059).

211020121021 is a wasteful number, since it uses less digits than its factorization.

211020121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211163.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211020121021 its reverse (120121020112), we get a palindrome (331141141133).

The spelling of 211020121021 in words is "two hundred eleven billion, twenty million, one hundred twenty-one thousand, twenty-one".