212031021121 has 2 divisors, whose sum is σ = 212031021122. Its totient is φ = 212031021120.

The previous prime is 212031021101. The next prime is 212031021157. The reversal of 212031021121 is 121120130212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137029530625 + 75001490496 = 370175^2 + 273864^2 .

It is a cyclic number.

It is not a de Polignac number, because 212031021121 - 2¹⁹ = 212030496833 is a prime.

It is a super-2 number, since 2×212031021121² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212031021095 and 212031021104.

It is not a weakly prime, because it can be changed into another prime (212031021101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106015510560 + 106015510561.

It is an arithmetic number, because the mean of its divisors is an integer number (106015510561).

Almost surely, 2^212031021121 is an apocalyptic number.

It is an amenable number.

212031021121 is a deficient number, since it is larger than the sum of its proper divisors (1).

212031021121 is an equidigital number, since it uses as much as digits as its factorization.

212031021121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 212031021121 its reverse (121120130212), we get a palindrome (333151151333).

The spelling of 212031021121 in words is "two hundred twelve billion, thirty-one million, twenty-one thousand, one hundred twenty-one".