21312233000 has 32 divisors (see below), whose sum is σ = 49870627560. Its totient is φ = 8524892800.

The previous prime is 21312232969. The next prime is 21312233027. The reversal of 21312233000 is 33221312.

It can be written as a sum of positive squares in 4 ways, for example, as 958645444 + 20353587556 = 30962^2 + 142666^2 .

It is a super-2 number, since 2×21312233000² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21312233000.

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 7 ways as a sum of consecutive naturals, for example, 10655117 + ... + 10657116.

Almost surely, 2^21312233000 is an apocalyptic number.

21312233000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21312233000 is an abundant number, since it is smaller than the sum of its proper divisors (28558394560).

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

21312233000 is a wasteful number, since it uses less digits than its factorization.

21312233000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21312254 (or 21312240 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21312233000 its reverse (33221312), we get a palindrome (21345454312).

The spelling of 21312233000 in words is "twenty-one billion, three hundred twelve million, two hundred thirty-three thousand".