21346021352 has 32 divisors (see below), whose sum is σ = 43268973600. Its totient is φ = 9837993024.

The previous prime is 21346021351. The next prime is 21346021357. The reversal of 21346021352 is 25312064312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21346021351) 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 7 ways as a sum of consecutive naturals, for example, 1892138 + ... + 1903385.

It is an arithmetic number, because the mean of its divisors is an integer number (1352155425).

Almost surely, 2^21346021352 is an apocalyptic number.

It is an amenable number.

21346021352 is an abundant number, since it is smaller than the sum of its proper divisors (21922952248).

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

21346021352 is a wasteful number, since it uses less digits than its factorization.

21346021352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3795585 (or 3795581 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 21346021352 its reverse (25312064312), we get a palindrome (46658085664).

The spelling of 21346021352 in words is "twenty-one billion, three hundred forty-six million, twenty-one thousand, three hundred fifty-two".