211020200020121 has 4 divisors (see below), whose sum is σ = 211571166600192. Its totient is φ = 210469233440052.

The previous prime is 211020200020079. The next prime is 211020200020139. The reversal of 211020200020121 is 121020002020112.

211020200020121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211020200020121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211020200020096 and 211020200020105.

It is not an unprimeable number, because it can be changed into a prime (211020200023121) 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, 275483289461 + ... + 275483290226.

It is an arithmetic number, because the mean of its divisors is an integer number (52892791650048).

Almost surely, 2^{211020200020121} is an apocalyptic number.

It is an amenable number.

211020200020121 is a deficient number, since it is larger than the sum of its proper divisors (550966580071).

211020200020121 is an equidigital number, since it uses as much as digits as its factorization.

211020200020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550966580070.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 211020200020121 its reverse (121020002020112), we get a palindrome (332040202040233).

The spelling of 211020200020121 in words is "two hundred eleven trillion, twenty billion, two hundred million, twenty thousand, one hundred twenty-one".