211111300020 has 48 divisors (see below), whose sum is σ = 591243262848. Its totient is φ = 56283811200.

The previous prime is 211111300019. The next prime is 211111300021. The reversal of 211111300020 is 20003111112.

It is an interprime number because it is at equal distance from previous prime (211111300019) and next prime (211111300021).

It is a super-2 number, since 2×211111300020² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 211111299969 and 211111300005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211111300021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118456 + ... + 660495.

It is an arithmetic number, because the mean of its divisors is an integer number (12317567976).

Almost surely, 2^211111300020 is an apocalyptic number.

211111300020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211111300020 is an abundant number, since it is smaller than the sum of its proper divisors (380131962828).

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

211111300020 is a wasteful number, since it uses less digits than its factorization.

211111300020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783480 (or 783478 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 211111300020 its reverse (20003111112), we get a palindrome (231114411132).

The spelling of 211111300020 in words is "two hundred eleven billion, one hundred eleven million, three hundred thousand, twenty".