1021220010157 has 2 divisors, whose sum is σ = 1021220010158. Its totient is φ = 1021220010156.

The previous prime is 1021220010143. The next prime is 1021220010169. The reversal of 1021220010157 is 7510100221201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 531340402761 + 489879607396 = 728931^2 + 699914^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021220010157 - 2⁷ = 1021220010029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021220010197) 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, 510610005078 + 510610005079.

It is an arithmetic number, because the mean of its divisors is an integer number (510610005079).

Almost surely, 2^{1021220010157} is an apocalyptic number.

It is an amenable number.

1021220010157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021220010157 is an equidigital number, since it uses as much as digits as its factorization.

1021220010157 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 22.

Adding to 1021220010157 its reverse (7510100221201), we get a palindrome (8531320231358).

The spelling of 1021220010157 in words is "one trillion, twenty-one billion, two hundred twenty million, ten thousand, one hundred fifty-seven".