212223040420 has 36 divisors (see below), whose sum is σ = 473426290260. Its totient is φ = 79895730688.

The previous prime is 212223040417. The next prime is 212223040423. The reversal of 212223040420 is 24040322212.

It is an interprime number because it is at equal distance from previous prime (212223040417) and next prime (212223040423).

It can be written as a sum of positive squares in 6 ways, for example, as 15479341056 + 196743699364 = 124416^2 + 443558^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212223040391 and 212223040400.

It is not an unprimeable number, because it can be changed into a prime (212223040423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18352615 + ... + 18364174.

It is an arithmetic number, because the mean of its divisors is an integer number (13150730285).

Almost surely, 2^212223040420 is an apocalyptic number.

212223040420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212223040420 is an abundant number, since it is smaller than the sum of its proper divisors (261203249840).

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

212223040420 is a wasteful number, since it uses less digits than its factorization.

212223040420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36716832 (or 36716813 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 212223040420 its reverse (24040322212), we get a palindrome (236263362632).

The spelling of 212223040420 in words is "two hundred twelve billion, two hundred twenty-three million, forty thousand, four hundred twenty".