20155115211 has 64 divisors (see below), whose sum is σ = 35158302720. Its totient is φ = 9958544640.

The previous prime is 20155115207. The next prime is 20155115311. The reversal of 20155115211 is 11251155102.

It is not a de Polignac number, because 20155115211 - 2² = 20155115207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20155115311) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 940431 + ... + 961623.

It is an arithmetic number, because the mean of its divisors is an integer number (549348480).

Almost surely, 2^20155115211 is an apocalyptic number.

20155115211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20155115211 is a deficient number, since it is larger than the sum of its proper divisors (15003187509).

20155115211 is a wasteful number, since it uses less digits than its factorization.

20155115211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21416.

The product of its (nonzero) digits is 500, while the sum is 24.

The spelling of 20155115211 in words is "twenty billion, one hundred fifty-five million, one hundred fifteen thousand, two hundred eleven".