21343134040 has 32 divisors (see below), whose sum is σ = 48056949360. Its totient is φ = 8531049600.

The previous prime is 21343134037. The next prime is 21343134047. The reversal of 21343134040 is 4043134312.

It is a junction number, because it is equal to n+sod(n) for n = 21343133996 and 21343134014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343134047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137946 + ... + 248425.

Almost surely, 2^21343134040 is an apocalyptic number.

21343134040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21343134040 is an abundant number, since it is smaller than the sum of its proper divisors (26713815320).

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

21343134040 is a wasteful number, since it uses less digits than its factorization.

21343134040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387763 (or 387759 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21343134040 its reverse (4043134312), we get a palindrome (25386268352).

The spelling of 21343134040 in words is "twenty-one billion, three hundred forty-three million, one hundred thirty-four thousand, forty".