211111211020 has 12 divisors (see below), whose sum is σ = 443333543184. Its totient is φ = 84444484400.

The previous prime is 211111210963. The next prime is 211111211023. The reversal of 211111211020 is 20112111112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (211111211023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5277780256 + ... + 5277780295.

It is an arithmetic number, because the mean of its divisors is an integer number (36944461932).

Almost surely, 2^211111211020 is an apocalyptic number.

211111211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211111211020 is an abundant number, since it is smaller than the sum of its proper divisors (232222332164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211111211020 is a wasteful number, since it uses less digits than its factorization.

211111211020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10555560560 (or 10555560558 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 211111211020 its reverse (20112111112), we get a palindrome (231223322132).

The spelling of 211111211020 in words is "two hundred eleven billion, one hundred eleven million, two hundred eleven thousand, twenty".