211354203121 has 2 divisors, whose sum is σ = 211354203122. Its totient is φ = 211354203120.

The previous prime is 211354203107. The next prime is 211354203131. The reversal of 211354203121 is 121302453112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178346580721 + 33007622400 = 422311^2 + 181680^2 .

It is a cyclic number.

It is not a de Polignac number, because 211354203121 - 2¹¹ = 211354201073 is a prime.

It is a super-2 number, since 2×211354203121² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211354203131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105677101560 + 105677101561.

It is an arithmetic number, because the mean of its divisors is an integer number (105677101561).

Almost surely, 2^211354203121 is an apocalyptic number.

It is an amenable number.

211354203121 is a deficient number, since it is larger than the sum of its proper divisors (1).

211354203121 is an equidigital number, since it uses as much as digits as its factorization.

211354203121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 211354203121 its reverse (121302453112), we get a palindrome (332656656233).

The spelling of 211354203121 in words is "two hundred eleven billion, three hundred fifty-four million, two hundred three thousand, one hundred twenty-one".