212111020 has 48 divisors (see below), whose sum is σ = 486920448. Its totient is φ = 76973760.

The previous prime is 212110981. The next prime is 212111027. The reversal of 212111020 is 20111212.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 212110988 and 212111006.

It is not an unprimeable number, because it can be changed into a prime (212111027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199009 + ... + 200071.

It is an arithmetic number, because the mean of its divisors is an integer number (10144176).

Almost surely, 2^212111020 is an apocalyptic number.

212111020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212111020 is an abundant number, since it is smaller than the sum of its proper divisors (274809428).

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

212111020 is a wasteful number, since it uses less digits than its factorization.

212111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1990 (or 1988 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 212111020 is about 14564.0317220198. The cubic root of 212111020 is about 596.3772629096.

Adding to 212111020 its reverse (20111212), we get a palindrome (232222232).

The spelling of 212111020 in words is "two hundred twelve million, one hundred eleven thousand, twenty".