212000021220 has 48 divisors (see below), whose sum is σ = 639261604800. Its totient is φ = 52184620416.

The previous prime is 212000021179. The next prime is 212000021227. The reversal of 212000021220 is 22120000212.

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 = 212000021196 and 212000021205.

It is not an unprimeable number, because it can be changed into a prime (212000021227) 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, 135896670 + ... + 135898229.

It is an arithmetic number, because the mean of its divisors is an integer number (13317950100).

Almost surely, 2^212000021220 is an apocalyptic number.

212000021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212000021220 is an abundant number, since it is smaller than the sum of its proper divisors (427261583580).

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

212000021220 is a wasteful number, since it uses less digits than its factorization.

212000021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271794924 (or 271794922 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 212000021220 its reverse (22120000212), we get a palindrome (234120021432).

The spelling of 212000021220 in words is "two hundred twelve billion, twenty-one thousand, two hundred twenty".