2120155771 has 8 divisors (see below), whose sum is σ = 2127984624. Its totient is φ = 2112337920.

The previous prime is 2120155769. The next prime is 2120155777. The reversal of 2120155771 is 1775510212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2120155771 - 2¹ = 2120155769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2120155777) 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 in 7 ways as a sum of consecutive naturals, for example, 629131 + ... + 632491.

It is an arithmetic number, because the mean of its divisors is an integer number (265998078).

Almost surely, 2^2120155771 is an apocalyptic number.

2120155771 is a deficient number, since it is larger than the sum of its proper divisors (7828853).

2120155771 is a wasteful number, since it uses less digits than its factorization.

2120155771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5501.

The product of its (nonzero) digits is 4900, while the sum is 31.

The square root of 2120155771 is about 46045.1492667794. The cubic root of 2120155771 is about 1284.6631205202.

Adding to 2120155771 its reverse (1775510212), we get a palindrome (3895665983).

The spelling of 2120155771 in words is "two billion, one hundred twenty million, one hundred fifty-five thousand, seven hundred seventy-one".