21200421102 has 32 divisors (see below), whose sum is σ = 48533064192. Its totient is φ = 6047893344.

The previous prime is 21200421049. The next prime is 21200421113. The reversal of 21200421102 is 20112400212.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 362913 + ... + 417260.

It is an arithmetic number, because the mean of its divisors is an integer number (1516658256).

Almost surely, 2^21200421102 is an apocalyptic number.

21200421102 is an abundant number, since it is smaller than the sum of its proper divisors (27332643090).

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

21200421102 is a wasteful number, since it uses less digits than its factorization.

21200421102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780832.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21200421102 its reverse (20112400212), we get a palindrome (41312821314).

The spelling of 21200421102 in words is "twenty-one billion, two hundred million, four hundred twenty-one thousand, one hundred two".