21456322340 has 48 divisors (see below), whose sum is σ = 47387676672. Its totient is φ = 8144712576.

The previous prime is 21456322331. The next prime is 21456322351. The reversal of 21456322340 is 4322365412.

It is a junction number, because it is equal to n+sod(n) for n = 21456322297 and 21456322306.

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, 125219 + ... + 242058.

It is an arithmetic number, because the mean of its divisors is an integer number (987243264).

Almost surely, 2^21456322340 is an apocalyptic number.

21456322340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21456322340 is an abundant number, since it is smaller than the sum of its proper divisors (25931354332).

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

21456322340 is a wasteful number, since it uses less digits than its factorization.

21456322340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367436 (or 367434 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 32.

Adding to 21456322340 its reverse (4322365412), we get a palindrome (25778687752).

The spelling of 21456322340 in words is "twenty-one billion, four hundred fifty-six million, three hundred twenty-two thousand, three hundred forty".