21011033000 has 32 divisors (see below), whose sum is σ = 49165819560. Its totient is φ = 8404412800.

The previous prime is 21011032981. The next prime is 21011033003. The reversal of 21011033000 is 33011012.

It can be written as a sum of positive squares in 4 ways, for example, as 1180197316 + 19830835684 = 34354^2 + 140822^2 .

It is not an unprimeable number, because it can be changed into a prime (21011033003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10504517 + ... + 10506516.

Almost surely, 2^21011033000 is an apocalyptic number.

21011033000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011033000 is an abundant number, since it is smaller than the sum of its proper divisors (28154786560).

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

21011033000 is a wasteful number, since it uses less digits than its factorization.

21011033000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21011054 (or 21011040 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 21011033000 its reverse (33011012), we get a palindrome (21044044012).

The spelling of 21011033000 in words is "twenty-one billion, eleven million, thirty-three thousand".