211020102020021 has 16 divisors (see below), whose sum is σ = 244220035584000. Its totient is φ = 178583747245488.

The previous prime is 211020102020003. The next prime is 211020102020051. The reversal of 211020102020021 is 120020201020112.

It is a cyclic number.

It is not a de Polignac number, because 211020102020021 - 2³⁴ = 211002922150837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211020102019978 and 211020102020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211020102020051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98423576 + ... + 100544718.

It is an arithmetic number, because the mean of its divisors is an integer number (15263752224000).

Almost surely, 2^{211020102020021} is an apocalyptic number.

It is an amenable number.

211020102020021 is a deficient number, since it is larger than the sum of its proper divisors (33199933563979).

211020102020021 is a wasteful number, since it uses less digits than its factorization.

211020102020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2301128.

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

Adding to 211020102020021 its reverse (120020201020112), we get a palindrome (331040303040133).

Subtracting from 211020102020021 its reverse (120020201020112), we obtain a palindrome (90999900999909).

The spelling of 211020102020021 in words is "two hundred eleven trillion, twenty billion, one hundred two million, twenty thousand, twenty-one".