21234443340 has 48 divisors (see below), whose sum is σ = 64861574400. Its totient is φ = 5147743680.

The previous prime is 21234443303. The next prime is 21234443353. The reversal of 21234443340 is 4334443212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21234443298 and 21234443307.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16086040 + ... + 16087359.

It is an arithmetic number, because the mean of its divisors is an integer number (1351282800).

Almost surely, 2^21234443340 is an apocalyptic number.

21234443340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21234443340 is an abundant number, since it is smaller than the sum of its proper divisors (43627131060).

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

21234443340 is a wasteful number, since it uses less digits than its factorization.

21234443340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32173422 (or 32173420 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 30.

Adding to 21234443340 its reverse (4334443212), we get a palindrome (25568886552).

The spelling of 21234443340 in words is "twenty-one billion, two hundred thirty-four million, four hundred forty-three thousand, three hundred forty".