1121213210021 has 2 divisors, whose sum is σ = 1121213210022. Its totient is φ = 1121213210020.

The previous prime is 1121213209999. The next prime is 1121213210099. The reversal of 1121213210021 is 1200123121211.

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., 1103865422500 + 17347787521 = 1050650^2 + 131711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121213210021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121213710021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560606605010 + 560606605011.

It is an arithmetic number, because the mean of its divisors is an integer number (560606605011).

Almost surely, 2^{1121213210021} is an apocalyptic number.

It is an amenable number.

1121213210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121213210021 is an equidigital number, since it uses as much as digits as its factorization.

1121213210021 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 17.

Adding to 1121213210021 its reverse (1200123121211), we get a palindrome (2321336331232).

The spelling of 1121213210021 in words is "one trillion, one hundred twenty-one billion, two hundred thirteen million, two hundred ten thousand, twenty-one".