21233513000 has 96 divisors (see below), whose sum is σ = 57798622440. Its totient is φ = 7280044800.

The previous prime is 21233512999. The next prime is 21233513003. The reversal of 21233513000 is 31533212.

It can be written as a sum of positive squares in 4 ways, for example, as 7129100356 + 14104412644 = 84434^2 + 118762^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (21233513003) by changing a digit.

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 in 23 ways as a sum of consecutive naturals, for example, 167669 + ... + 265668.

Almost surely, 2^21233513000 is an apocalyptic number.

21233513000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21233513000 is an abundant number, since it is smaller than the sum of its proper divisors (36565109440).

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

21233513000 is a wasteful number, since it uses less digits than its factorization.

21233513000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433372 (or 433351 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 20.

The spelling of 21233513000 in words is "twenty-one billion, two hundred thirty-three million, five hundred thirteen thousand".