212021121311 has 2 divisors, whose sum is σ = 212021121312.
Its totient is φ = 212021121310.
The previous prime is 212021121281. The next prime is 212021121331. The reversal of 212021121311 is 113121120212.
It is a happy number.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 212021121311 - 234 = 194841252127 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 212021121311.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (212021121331) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010560655 + 106010560656.
It is an arithmetic number, because the mean of its divisors is an integer number (106010560656).
Almost surely, 2212021121311 is an apocalyptic number.
212021121311 is a deficient number, since it is larger than the sum of its proper divisors (1).
212021121311 is an equidigital number, since it uses as much as digits as its factorization.
212021121311 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 48, while the sum is 17.
Adding to 212021121311 its reverse (113121120212), we get a palindrome (325142241523).
The spelling of 212021121311 in words is "two hundred twelve billion, twenty-one million, one hundred twenty-one thousand, three hundred eleven".