21233578610 has 24 divisors (see below), whose sum is σ = 39954460140. Its totient is φ = 8124149792.

The previous prime is 21233578571. The next prime is 21233578673. The reversal of 21233578610 is 1687533212.

It can be written as a sum of positive squares in 2 ways, for example, as 20525433289 + 708145321 = 143267^2 + 26611^2 .

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 2001665 + ... + 2012244.

Almost surely, 2^21233578610 is an apocalyptic number.

21233578610 is a deficient number, since it is larger than the sum of its proper divisors (18720881530).

21233578610 is a wasteful number, since it uses less digits than its factorization.

21233578610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4013962 (or 4013939 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 21233578610 in words is "twenty-one billion, two hundred thirty-three million, five hundred seventy-eight thousand, six hundred ten".