1021213111 has 2 divisors, whose sum is σ = 1021213112. Its totient is φ = 1021213110.

The previous prime is 1021213091. The next prime is 1021213247. The reversal of 1021213111 is 1113121201.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1113121201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021213111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021213091 and 1021213100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021213411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510606555 + 510606556.

It is an arithmetic number, because the mean of its divisors is an integer number (510606556).

Almost surely, 2^1021213111 is an apocalyptic number.

1021213111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021213111 is an equidigital number, since it uses as much as digits as its factorization.

1021213111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1021213111 is about 31956.4251911881. The cubic root of 1021213111 is about 1007.0216184780.

Adding to 1021213111 its reverse (1113121201), we get a palindrome (2134334312).

The spelling of 1021213111 in words is "one billion, twenty-one million, two hundred thirteen thousand, one hundred eleven".