21112253340 has 24 divisors (see below), whose sum is σ = 59114309520. Its totient is φ = 5629934208.

The previous prime is 21112253333. The next prime is 21112253347. The reversal of 21112253340 is 4335221112.

It is an interprime number because it is at equal distance from previous prime (21112253333) and next prime (21112253347).

It is a self number, because there is not a number n which added to its sum of digits gives 21112253340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112253347) by changing a digit.

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, 175935385 + ... + 175935504.

It is an arithmetic number, because the mean of its divisors is an integer number (2463096230).

Almost surely, 2^21112253340 is an apocalyptic number.

21112253340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112253340 is an abundant number, since it is smaller than the sum of its proper divisors (38002056180).

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

21112253340 is a wasteful number, since it uses less digits than its factorization.

21112253340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351870901 (or 351870899 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21112253340 its reverse (4335221112), we get a palindrome (25447474452).

It can be divided in two parts, 211122 and 53340, that added together give a palindrome (264462).

The spelling of 21112253340 in words is "twenty-one billion, one hundred twelve million, two hundred fifty-three thousand, three hundred forty".