2157220797013 has 2 divisors, whose sum is σ = 2157220797014. Its totient is φ = 2157220797012.

The previous prime is 2157220796821. The next prime is 2157220797019. The reversal of 2157220797013 is 3107970227512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1514885871249 + 642334925764 = 1230807^2 + 801458^2 .

It is a cyclic number.

It is not a de Polignac number, because 2157220797013 - 2⁹ = 2157220796501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2157220797019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078610398506 + 1078610398507.

It is an arithmetic number, because the mean of its divisors is an integer number (1078610398507).

Almost surely, 2^{2157220797013} is an apocalyptic number.

It is an amenable number.

2157220797013 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157220797013 is an equidigital number, since it uses as much as digits as its factorization.

2157220797013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 370440, while the sum is 46.

The spelling of 2157220797013 in words is "two trillion, one hundred fifty-seven billion, two hundred twenty million, seven hundred ninety-seven thousand, thirteen".