21133353464 has 8 divisors (see below), whose sum is σ = 39625037760. Its totient is φ = 10566676728.

The previous prime is 21133353407. The next prime is 21133353469. The reversal of 21133353464 is 46435333112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133353469) 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 as a sum of consecutive naturals, namely, 1320834584 + ... + 1320834599.

It is an arithmetic number, because the mean of its divisors is an integer number (4953129720).

Almost surely, 2^21133353464 is an apocalyptic number.

It is an amenable number.

21133353464 is a deficient number, since it is larger than the sum of its proper divisors (18491684296).

21133353464 is a wasteful number, since it uses less digits than its factorization.

21133353464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2641669189 (or 2641669185 counting only the distinct ones).

The product of its digits is 77760, while the sum is 35.

Adding to 21133353464 its reverse (46435333112), we get a palindrome (67568686576).

The spelling of 21133353464 in words is "twenty-one billion, one hundred thirty-three million, three hundred fifty-three thousand, four hundred sixty-four".