211100020 has 24 divisors (see below), whose sum is σ = 443880864. Its totient is φ = 84331296.

The previous prime is 211100017. The next prime is 211100023. The reversal of 211100020 is 20001112.

It is an interprime number because it is at equal distance from previous prime (211100017) and next prime (211100023).

It is a junction number, because it is equal to n+sod(n) for n = 211099976 and 211100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211100023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10159 + ... + 22921.

It is an arithmetic number, because the mean of its divisors is an integer number (18495036).

Almost surely, 2^211100020 is an apocalyptic number.

211100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211100020 is an abundant number, since it is smaller than the sum of its proper divisors (232780844).

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

211100020 is a wasteful number, since it uses less digits than its factorization.

211100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13599 (or 13597 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 211100020 is about 14529.2814688132. The cubic root of 211100020 is about 595.4282348977.

Adding to 211100020 its reverse (20001112), we get a palindrome (231101132).

The spelling of 211100020 in words is "two hundred eleven million, one hundred thousand, twenty".