21124301200 has 30 divisors (see below), whose sum is σ = 50751134594. Its totient is φ = 8449720320.

The previous prime is 21124301179. The next prime is 21124301291. The reversal of 21124301200 is 210342112.

It can be written as a sum of positive squares in 3 ways, for example, as 1573550224 + 19550750976 = 39668^2 + 139824^2 .

It is a super-2 number, since 2×21124301200² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26404977 + ... + 26405776.

Almost surely, 2^21124301200 is an apocalyptic number.

21124301200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21124301200 is an abundant number, since it is smaller than the sum of its proper divisors (29626833394).

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

21124301200 is a wasteful number, since it uses less digits than its factorization.

21124301200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52810771 (or 52810760 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21124301200 its reverse (210342112), we get a palindrome (21334643312).

The spelling of 21124301200 in words is "twenty-one billion, one hundred twenty-four million, three hundred one thousand, two hundred".