2120155665201 has 48 divisors (see below), whose sum is σ = 3504296480256. Its totient is φ = 1210010393088.

The previous prime is 2120155665041. The next prime is 2120155665241. The reversal of 2120155665201 is 1025665510212.

2120155665201 is a `hidden beast` number, since 2 + 1 + 20 + 1 + 55 + 66 + 520 + 1 = 666.

It is not a de Polignac number, because 2120155665201 - 2²² = 2120151470897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2120155665241) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 190776021 + ... + 190787133.

It is an arithmetic number, because the mean of its divisors is an integer number (73006176672).

Almost surely, 2^{2120155665201} is an apocalyptic number.

2120155665201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2120155665201 is a deficient number, since it is larger than the sum of its proper divisors (1384140815055).

2120155665201 is a wasteful number, since it uses less digits than its factorization.

2120155665201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14622 (or 14619 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The spelling of 2120155665201 in words is "two trillion, one hundred twenty billion, one hundred fifty-five million, six hundred sixty-five thousand, two hundred one".