21203010000 has 300 divisors, whose sum is σ = 77381455008. Its totient is φ = 5407776000.

The previous prime is 21203009999. The next prime is 21203010001. The reversal of 21203010000 is 1030212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21203009999) and next prime (21203010001).

It is a tau number, because it is divible by the number of its divisors (300).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203010001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 2064879 + ... + 2075121.

Almost surely, 2^21203010000 is an apocalyptic number.

21203010000 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 21203010000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38690727504).

21203010000 is an abundant number, since it is smaller than the sum of its proper divisors (56178445008).

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

21203010000 is a wasteful number, since it uses less digits than its factorization.

21203010000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10300 (or 10276 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 21203010000 its reverse (1030212), we get a palindrome (21204040212).

The spelling of 21203010000 in words is "twenty-one billion, two hundred three million, ten thousand".