21320553346 has 8 divisors (see below), whose sum is σ = 32724570384. Its totient is φ = 10412363220.

The previous prime is 21320553329. The next prime is 21320553347. The reversal of 21320553346 is 64335502312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21320553347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123956620 + ... + 123956791.

It is an arithmetic number, because the mean of its divisors is an integer number (4090571298).

Almost surely, 2^21320553346 is an apocalyptic number.

21320553346 is a deficient number, since it is larger than the sum of its proper divisors (11404017038).

21320553346 is a wasteful number, since it uses less digits than its factorization.

21320553346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247913456.

The product of its (nonzero) digits is 64800, while the sum is 34.

The spelling of 21320553346 in words is "twenty-one billion, three hundred twenty million, five hundred fifty-three thousand, three hundred forty-six".