21203002000 has 80 divisors (see below), whose sum is σ = 53036895600. Its totient is φ = 8188723200.

The previous prime is 21203001997. The next prime is 21203002003. The reversal of 21203002000 is 20030212.

It is an interprime number because it is at equal distance from previous prime (21203001997) and next prime (21203002003).

It can be written as a sum of positive squares in 8 ways, for example, as 10028820736 + 11174181264 = 100144^2 + 105708^2 .

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

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

It is not an unprimeable number, because it can be changed into a prime (21203002003) 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, 124785 + ... + 240784.

It is an arithmetic number, because the mean of its divisors is an integer number (662961195).

Almost surely, 2^21203002000 is an apocalyptic number.

21203002000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21203002000 is an abundant number, since it is smaller than the sum of its proper divisors (31833893600).

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

21203002000 is a wasteful number, since it uses less digits than its factorization.

21203002000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365621 (or 365605 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

Adding to 21203002000 its reverse (20030212), we get a palindrome (21223032212).

The spelling of 21203002000 in words is "twenty-one billion, two hundred three million, two thousand".