21123030102 has 32 divisors (see below), whose sum is σ = 43579544064. Its totient is φ = 6822208800.

The previous prime is 21123030079. The next prime is 21123030119. The reversal of 21123030102 is 20103032112.

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, 406174 + ... + 455217.

It is an arithmetic number, because the mean of its divisors is an integer number (1361860752).

Almost surely, 2^21123030102 is an apocalyptic number.

21123030102 is an abundant number, since it is smaller than the sum of its proper divisors (22456513962).

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

21123030102 is a wasteful number, since it uses less digits than its factorization.

21123030102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861524.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21123030102 its reverse (20103032112), we get a palindrome (41226062214).

The spelling of 21123030102 in words is "twenty-one billion, one hundred twenty-three million, thirty thousand, one hundred two".