21243411102 has 32 divisors (see below), whose sum is σ = 44187494400. Its totient is φ = 6802537248.

The previous prime is 21243411097. The next prime is 21243411109. The reversal of 21243411102 is 20111434212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243411109) by changing a digit.

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, 588102 + ... + 623177.

It is an arithmetic number, because the mean of its divisors is an integer number (1380859200).

Almost surely, 2^21243411102 is an apocalyptic number.

21243411102 is an abundant number, since it is smaller than the sum of its proper divisors (22944083298).

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

21243411102 is a wasteful number, since it uses less digits than its factorization.

21243411102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211400.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21243411102 its reverse (20111434212), we get a palindrome (41354845314).

The spelling of 21243411102 in words is "twenty-one billion, two hundred forty-three million, four hundred eleven thousand, one hundred two".