211203212021 has 2 divisors, whose sum is σ = 211203212022. Its totient is φ = 211203212020.

The previous prime is 211203211979. The next prime is 211203212029. The reversal of 211203212021 is 120212302112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211150359121 + 52852900 = 459511^2 + 7270^2 .

It is a cyclic number.

It is not a de Polignac number, because 211203212021 - 2¹⁸ = 211202949877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211203212029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105601606010 + 105601606011.

It is an arithmetic number, because the mean of its divisors is an integer number (105601606011).

Almost surely, 2^211203212021 is an apocalyptic number.

It is an amenable number.

211203212021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211203212021 is an equidigital number, since it uses as much as digits as its factorization.

211203212021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 211203212021 its reverse (120212302112), we get a palindrome (331415514133).

Subtracting from 211203212021 its reverse (120212302112), we obtain a palindrome (90990909909).

The spelling of 211203212021 in words is "two hundred eleven billion, two hundred three million, two hundred twelve thousand, twenty-one".