21325353416 has 8 divisors (see below), whose sum is σ = 39985037670. Its totient is φ = 10662676704.

The previous prime is 21325353403. The next prime is 21325353433. The reversal of 21325353416 is 61435352312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17225512516 + 4099840900 = 131246^2 + 64030^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332834581 + ... + 1332834596.

Almost surely, 2^21325353416 is an apocalyptic number.

It is an amenable number.

21325353416 is a deficient number, since it is larger than the sum of its proper divisors (18659684254).

21325353416 is a wasteful number, since it uses less digits than its factorization.

21325353416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2665669183 (or 2665669179 counting only the distinct ones).

The product of its digits is 64800, while the sum is 35.

The spelling of 21325353416 in words is "twenty-one billion, three hundred twenty-five million, three hundred fifty-three thousand, four hundred sixteen".