21231203422340 has 24 divisors (see below), whose sum is σ = 44590901227992. Its totient is φ = 8491457742080.

The previous prime is 21231203422277. The next prime is 21231203422361. The reversal of 21231203422340 is 4322430213212.

It can be written as a sum of positive squares in 4 ways, for example, as 15185938723396 + 6045264698944 = 3896914^2 + 2458712^2 .

It is a super-2 number, since 2×21231203422340² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63806591 + ... + 64138470.

It is an arithmetic number, because the mean of its divisors is an integer number (1857954217833).

Almost surely, 2^{21231203422340} is an apocalyptic number.

21231203422340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21231203422340 is an abundant number, since it is smaller than the sum of its proper divisors (23359697805652).

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

21231203422340 is a wasteful number, since it uses less digits than its factorization.

21231203422340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127953367 (or 127953365 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21231203422340 its reverse (4322430213212), we get a palindrome (25553633635552).

The spelling of 21231203422340 in words is "twenty-one trillion, two hundred thirty-one billion, two hundred three million, four hundred twenty-two thousand, three hundred forty".