101021555120389 has 2 divisors, whose sum is σ = 101021555120390. Its totient is φ = 101021555120388.

The previous prime is 101021555120363. The next prime is 101021555120429. The reversal of 101021555120389 is 983021555120101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95910487692100 + 5111067428289 = 9793390^2 + 2260767^2 .

It is a cyclic number.

It is not a de Polignac number, because 101021555120389 - 2¹³ = 101021555112197 is a prime.

It is a super-2 number, since 2×101021555120389² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101021555120309) 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, 50510777560194 + 50510777560195.

It is an arithmetic number, because the mean of its divisors is an integer number (50510777560195).

Almost surely, 2^{101021555120389} is an apocalyptic number.

It is an amenable number.

101021555120389 is a deficient number, since it is larger than the sum of its proper divisors (1).

101021555120389 is an equidigital number, since it uses as much as digits as its factorization.

101021555120389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108000, while the sum is 43.

The spelling of 101021555120389 in words is "one hundred one trillion, twenty-one billion, five hundred fifty-five million, one hundred twenty thousand, three hundred eighty-nine".