21145004300 has 108 divisors (see below), whose sum is σ = 53491670064. Its totient is φ = 7234012800.

The previous prime is 21145004273. The next prime is 21145004327. The reversal of 21145004300 is 340054112.

It is an interprime number because it is at equal distance from previous prime (21145004273) and next prime (21145004327).

It is a super-2 number, since 2×21145004300² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2381870 + ... + 2390730.

Almost surely, 2^21145004300 is an apocalyptic number.

21145004300 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 21145004300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26745835032).

21145004300 is an abundant number, since it is smaller than the sum of its proper divisors (32346665764).

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

21145004300 is a wasteful number, since it uses less digits than its factorization.

21145004300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9376 (or 9362 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21145004300 its reverse (340054112), we get a palindrome (21485058412).

The spelling of 21145004300 in words is "twenty-one billion, one hundred forty-five million, four thousand, three hundred".