21351222340 has 24 divisors (see below), whose sum is σ = 51242933952. Its totient is φ = 7320419040.

The previous prime is 21351222289. The next prime is 21351222397. The reversal of 21351222340 is 4322215312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76254226 + ... + 76254505.

It is an arithmetic number, because the mean of its divisors is an integer number (2135122248).

Almost surely, 2^21351222340 is an apocalyptic number.

21351222340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21351222340 is an abundant number, since it is smaller than the sum of its proper divisors (29891711612).

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

21351222340 is a wasteful number, since it uses less digits than its factorization.

21351222340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152508747 (or 152508745 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21351222340 its reverse (4322215312), we get a palindrome (25673437652).

The spelling of 21351222340 in words is "twenty-one billion, three hundred fifty-one million, two hundred twenty-two thousand, three hundred forty".