21421400200 has 24 divisors (see below), whose sum is σ = 49804755930. Its totient is φ = 8568560000.

The previous prime is 21421400153. The next prime is 21421400201. The reversal of 21421400200 is 200412412.

It can be written as a sum of positive squares in 3 ways, for example, as 11690366884 + 9731033316 = 108122^2 + 98646^2 .

It is not an unprimeable number, because it can be changed into a prime (21421400201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53553301 + ... + 53553700.

Almost surely, 2^21421400200 is an apocalyptic number.

21421400200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21421400200 is an abundant number, since it is smaller than the sum of its proper divisors (28383355730).

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

21421400200 is a wasteful number, since it uses less digits than its factorization.

21421400200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107107017 (or 107107008 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21421400200 its reverse (200412412), we get a palindrome (21621812612).

The spelling of 21421400200 in words is "twenty-one billion, four hundred twenty-one million, four hundred thousand, two hundred".