1020212191 has 2 divisors, whose sum is σ = 1020212192. Its totient is φ = 1020212190.

The previous prime is 1020212189. The next prime is 1020212203. The reversal of 1020212191 is 1912120201.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1020212191 - 2¹ = 1020212189 is a prime.

Together with 1020212189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020212161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510106095 + 510106096.

It is an arithmetic number, because the mean of its divisors is an integer number (510106096).

Almost surely, 2^1020212191 is an apocalyptic number.

1020212191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020212191 is an equidigital number, since it uses as much as digits as its factorization.

1020212191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 1020212191 is about 31940.7606515562. The cubic root of 1020212191 is about 1006.6925074260.

Adding to 1020212191 its reverse (1912120201), we get a palindrome (2932332392).

The spelling of 1020212191 in words is "one billion, twenty million, two hundred twelve thousand, one hundred ninety-one".