21011023000 has 256 divisors, whose sum is σ = 55132721280. Its totient is φ = 7430400000.

The previous prime is 21011022961. The next prime is 21011023051. The reversal of 21011023000 is 32011012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 116082910 + ... + 116083090.

Almost surely, 2^21011023000 is an apocalyptic number.

21011023000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21011023000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27566360640).

21011023000 is an abundant number, since it is smaller than the sum of its proper divisors (34121698280).

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

21011023000 is a wasteful number, since it uses less digits than its factorization.

21011023000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447 (or 433 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21011023000 its reverse (32011012), we get a palindrome (21043034012).

The spelling of 21011023000 in words is "twenty-one billion, eleven million, twenty-three thousand".