1011020212157 has 2 divisors, whose sum is σ = 1011020212158. Its totient is φ = 1011020212156.

The previous prime is 1011020212079. The next prime is 1011020212159. The reversal of 1011020212157 is 7512120201101.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 634031580121 + 376988632036 = 796261^2 + 613994^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011020212157 - 2²⁴ = 1011003434941 is a prime.

Together with 1011020212159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011020212159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505510106078 + 505510106079.

It is an arithmetic number, because the mean of its divisors is an integer number (505510106079).

Almost surely, 2^{1011020212157} is an apocalyptic number.

It is an amenable number.

1011020212157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011020212157 is an equidigital number, since it uses as much as digits as its factorization.

1011020212157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 23.

Adding to 1011020212157 its reverse (7512120201101), we get a palindrome (8523140413258).

The spelling of 1011020212157 in words is "one trillion, eleven billion, twenty million, two hundred twelve thousand, one hundred fifty-seven".