111212222021101 has 2 divisors, whose sum is σ = 111212222021102. Its totient is φ = 111212222021100.

The previous prime is 111212222021077. The next prime is 111212222021143. The reversal of 111212222021101 is 101120222212111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81670062048201 + 29542159972900 = 9037149^2 + 5435270^2 .

It is a cyclic number.

It is not a de Polignac number, because 111212222021101 - 2⁷ = 111212222020973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111212222021701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55606111010550 + 55606111010551.

It is an arithmetic number, because the mean of its divisors is an integer number (55606111010551).

Almost surely, 2^{111212222021101} is an apocalyptic number.

It is an amenable number.

111212222021101 is a deficient number, since it is larger than the sum of its proper divisors (1).

111212222021101 is an equidigital number, since it uses as much as digits as its factorization.

111212222021101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 111212222021101 its reverse (101120222212111), we get a palindrome (212332444233212).

The spelling of 111212222021101 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred twenty-two million, twenty-one thousand, one hundred one".