2100155377 has 2 divisors, whose sum is σ = 2100155378. Its totient is φ = 2100155376.

The previous prime is 2100155359. The next prime is 2100155383. The reversal of 2100155377 is 7735510012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1699995361 + 400160016 = 41231^2 + 20004^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100155377 - 2¹¹ = 2100153329 is a prime.

It is not a weakly prime, because it can be changed into another prime (2100155347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050077688 + 1050077689.

It is an arithmetic number, because the mean of its divisors is an integer number (1050077689).

Almost surely, 2^2100155377 is an apocalyptic number.

It is an amenable number.

2100155377 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100155377 is an equidigital number, since it uses as much as digits as its factorization.

2100155377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7350, while the sum is 31.

The square root of 2100155377 is about 45827.4522202577. The cubic root of 2100155377 is about 1280.6107471529.

Adding to 2100155377 its reverse (7735510012), we get a palindrome (9835665389).

The spelling of 2100155377 in words is "two billion, one hundred million, one hundred fifty-five thousand, three hundred seventy-seven".