21420740200 has 48 divisors (see below), whose sum is σ = 49942116000. Its totient is φ = 8544400320.

The previous prime is 21420740191. The next prime is 21420740219. The reversal of 21420740200 is 204702412.

It is a happy number.

It is a super-2 number, since 2×21420740200² (a number of 21 digits) contains 22 as substring.

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, 77370 + ... + 220969.

It is an arithmetic number, because the mean of its divisors is an integer number (1040460750).

Almost surely, 2^21420740200 is an apocalyptic number.

21420740200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21420740200 is an abundant number, since it is smaller than the sum of its proper divisors (28521375800).

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

21420740200 is a wasteful number, since it uses less digits than its factorization.

21420740200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298714 (or 298705 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 22.

The spelling of 21420740200 in words is "twenty-one billion, four hundred twenty million, seven hundred forty thousand, two hundred".