21123640233340 has 24 divisors (see below), whose sum is σ = 46288324686240. Its totient is φ = 8082088436928.

The previous prime is 21123640233323. The next prime is 21123640233349. The reversal of 21123640233340 is 4333204632112.

It is a junction number, because it is equal to n+sod(n) for n = 21123640233296 and 21123640233305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123640233349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22960478055 + ... + 22960478974.

It is an arithmetic number, because the mean of its divisors is an integer number (1928680195260).

Almost surely, 2^{21123640233340} is an apocalyptic number.

21123640233340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21123640233340 is an abundant number, since it is smaller than the sum of its proper divisors (25164684452900).

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

21123640233340 is a wasteful number, since it uses less digits than its factorization.

21123640233340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45920957061 (or 45920957059 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 34.

Adding to 21123640233340 its reverse (4333204632112), we get a palindrome (25456844865452).

The spelling of 21123640233340 in words is "twenty-one trillion, one hundred twenty-three billion, six hundred forty million, two hundred thirty-three thousand, three hundred forty".