21031010000 has 600 divisors, whose sum is σ = 69244234752. Its totient is φ = 6019200000.

The previous prime is 21031009973. The next prime is 21031010003. The reversal of 21031010000 is 1013012.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21031010000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031010003) by changing a digit.

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 119 ways as a sum of consecutive naturals, for example, 110109905 + ... + 110110095.

Almost surely, 2^21031010000 is an apocalyptic number.

21031010000 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 21031010000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34622117376).

21031010000 is an abundant number, since it is smaller than the sum of its proper divisors (48213224752).

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

21031010000 is a wasteful number, since it uses less digits than its factorization.

21031010000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 8.

Adding to 21031010000 its reverse (1013012), we get a palindrome (21032023012).

The spelling of 21031010000 in words is "twenty-one billion, thirty-one million, ten thousand".