21003200370 has 80 divisors (see below), whose sum is σ = 56822103360. Its totient is φ = 5566457376.

The previous prime is 21003200363. The next prime is 21003200371. The reversal of 21003200370 is 7300230012.

It is a super-2 number, since 2×21003200370² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21003200371) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 52491 + ... + 211569.

It is an arithmetic number, because the mean of its divisors is an integer number (710276292).

Almost surely, 2^21003200370 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21003200370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28411051680).

21003200370 is an abundant number, since it is smaller than the sum of its proper divisors (35818902990).

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

21003200370 is a wasteful number, since it uses less digits than its factorization.

21003200370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159261 (or 159252 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

Adding to 21003200370 its reverse (7300230012), we get a palindrome (28303430382).

The spelling of 21003200370 in words is "twenty-one billion, three million, two hundred thousand, three hundred seventy".