21200421498 has 16 divisors (see below), whose sum is σ = 42402381600. Its totient is φ = 7066550736.

The previous prime is 21200421469. The next prime is 21200421527. The reversal of 21200421498 is 89412400212.

It is an interprime number because it is at equal distance from previous prime (21200421469) and next prime (21200421527).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196536 + ... + 284652.

It is an arithmetic number, because the mean of its divisors is an integer number (2650148850).

Almost surely, 2^21200421498 is an apocalyptic number.

21200421498 is an abundant number, since it is smaller than the sum of its proper divisors (21201960102).

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

21200421498 is a wasteful number, since it uses less digits than its factorization.

21200421498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128221.

The product of its (nonzero) digits is 9216, while the sum is 33.

The spelling of 21200421498 in words is "twenty-one billion, two hundred million, four hundred twenty-one thousand, four hundred ninety-eight".