21131302000 has 80 divisors (see below), whose sum is σ = 51711502752. Its totient is φ = 8350617600.

The previous prime is 21131301979. The next prime is 21131302009. The reversal of 21131302000 is 20313112.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131302009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102352 + ... + 229648.

Almost surely, 2^21131302000 is an apocalyptic number.

21131302000 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 21131302000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25855751376).

21131302000 is an abundant number, since it is smaller than the sum of its proper divisors (30580200752).

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

21131302000 is a wasteful number, since it uses less digits than its factorization.

21131302000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127403 (or 127387 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21131302000 its reverse (20313112), we get a palindrome (21151615112).

The spelling of 21131302000 in words is "twenty-one billion, one hundred thirty-one million, three hundred two thousand".