2101122155 has 8 divisors (see below), whose sum is σ = 2750559984. Its totient is φ = 1528088800.

The previous prime is 2101122137. The next prime is 2101122161. The reversal of 2101122155 is 5512211012.

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

It is not a de Polignac number, because 2101122155 - 2⁶ = 2101122091 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19101056 + ... + 19101165.

It is an arithmetic number, because the mean of its divisors is an integer number (343819998).

Almost surely, 2^2101122155 is an apocalyptic number.

2101122155 is a deficient number, since it is larger than the sum of its proper divisors (649437829).

2101122155 is a wasteful number, since it uses less digits than its factorization.

2101122155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38202237.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 2101122155 is about 45837.9990291897. Note that the first 3 decimals coincide. The cubic root of 2101122155 is about 1280.8072209286.

Adding to 2101122155 its reverse (5512211012), we get a palindrome (7613333167).

The spelling of 2101122155 in words is "two billion, one hundred one million, one hundred twenty-two thousand, one hundred fifty-five".