21340312120 has 64 divisors (see below), whose sum is σ = 48687962400. Its totient is φ = 8417364480.

The previous prime is 21340312093. The next prime is 21340312127. The reversal of 21340312120 is 2121304312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340312127) 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, 908362 + ... + 931558.

Almost surely, 2^21340312120 is an apocalyptic number.

21340312120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21340312120 is an abundant number, since it is smaller than the sum of its proper divisors (27347650280).

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

21340312120 is a wasteful number, since it uses less digits than its factorization.

21340312120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23528 (or 23524 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21340312120 its reverse (2121304312), we get a palindrome (23461616432).

The spelling of 21340312120 in words is "twenty-one billion, three hundred forty million, three hundred twelve thousand, one hundred twenty".