21242402200 has 48 divisors (see below), whose sum is σ = 49400030160. Its totient is φ = 8494992000.

The previous prime is 21242402197. The next prime is 21242402221. The reversal of 21242402200 is 220424212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1106685 + ... + 1125715.

It is an arithmetic number, because the mean of its divisors is an integer number (1029167295).

Almost surely, 2^21242402200 is an apocalyptic number.

21242402200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21242402200 is an abundant number, since it is smaller than the sum of its proper divisors (28157627960).

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

21242402200 is a wasteful number, since it uses less digits than its factorization.

21242402200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24628 (or 24619 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 21242402200 its reverse (220424212), we get a palindrome (21462826412).

The spelling of 21242402200 in words is "twenty-one billion, two hundred forty-two million, four hundred two thousand, two hundred".