21338302146 has 96 divisors (see below), whose sum is σ = 52765839360. Its totient is φ = 5719551264.

The previous prime is 21338302133. The next prime is 21338302147. The reversal of 21338302146 is 64120383312.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21338302147) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 556815 + ... + 593901.

It is an arithmetic number, because the mean of its divisors is an integer number (549644160).

Almost surely, 2^21338302146 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21338302146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26382919680).

21338302146 is an abundant number, since it is smaller than the sum of its proper divisors (31427537214).

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

21338302146 is a wasteful number, since it uses less digits than its factorization.

21338302146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37228 (or 37221 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

Adding to 21338302146 its reverse (64120383312), we get a palindrome (85458685458).

The spelling of 21338302146 in words is "twenty-one billion, three hundred thirty-eight million, three hundred two thousand, one hundred forty-six".