212323204340 has 48 divisors (see below), whose sum is σ = 491888754000. Its totient is φ = 76484152320.

The previous prime is 212323204333. The next prime is 212323204343. The reversal of 212323204340 is 43402323212.

It can be written as a sum of positive squares in 8 ways, for example, as 8981731984 + 203341472356 = 94772^2 + 450934^2 .

It is a super-2 number, since 2×212323204340² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212323204343) 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, 9948215 + ... + 9969534.

It is an arithmetic number, because the mean of its divisors is an integer number (10247682375).

Almost surely, 2^212323204340 is an apocalyptic number.

212323204340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212323204340 is an abundant number, since it is smaller than the sum of its proper divisors (279565549660).

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

212323204340 is a wasteful number, since it uses less digits than its factorization.

212323204340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19917812 (or 19917810 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 212323204340 its reverse (43402323212), we get a palindrome (255725527552).

The spelling of 212323204340 in words is "two hundred twelve billion, three hundred twenty-three million, two hundred four thousand, three hundred forty".