21420053200 has 120 divisors (see below), whose sum is σ = 63337557248. Its totient is φ = 6779082240.

The previous prime is 21420053197. The next prime is 21420053201. The reversal of 21420053200 is 235002412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420053201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 257832 + ... + 330631.

Almost surely, 2^21420053200 is an apocalyptic number.

21420053200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21420053200 is an abundant number, since it is smaller than the sum of its proper divisors (41917504048).

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

21420053200 is a wasteful number, since it uses less digits than its factorization.

21420053200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588501 (or 588490 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

Adding to 21420053200 its reverse (235002412), we get a palindrome (21655055612).

The spelling of 21420053200 in words is "twenty-one billion, four hundred twenty million, fifty-three thousand, two hundred".