1011020120291 has 2 divisors, whose sum is σ = 1011020120292. Its totient is φ = 1011020120290.

The previous prime is 1011020120249. The next prime is 1011020120293. The reversal of 1011020120291 is 1920210201101.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011020120291 is a prime.

Together with 1011020120293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1011020120293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505510060145 + 505510060146.

It is an arithmetic number, because the mean of its divisors is an integer number (505510060146).

Almost surely, 2^{1011020120291} is an apocalyptic number.

1011020120291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011020120291 is an equidigital number, since it uses as much as digits as its factorization.

1011020120291 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 20.

Adding to 1011020120291 its reverse (1920210201101), we get a palindrome (2931230321392).

It can be divided in two parts, 1011020 and 120291, that added together give a palindrome (1131311).

The spelling of 1011020120291 in words is "one trillion, eleven billion, twenty million, one hundred twenty thousand, two hundred ninety-one".