21331434102 has 64 divisors (see below), whose sum is σ = 50315040000. Its totient is φ = 5958334080.

The previous prime is 21331434077. The next prime is 21331434107. The reversal of 21331434102 is 20143413312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331434107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 183477 + ... + 276272.

It is an arithmetic number, because the mean of its divisors is an integer number (786172500).

Almost surely, 2^21331434102 is an apocalyptic number.

21331434102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21331434102 is an abundant number, since it is smaller than the sum of its proper divisors (28983605898).

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

21331434102 is a wasteful number, since it uses less digits than its factorization.

21331434102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459821.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21331434102 its reverse (20143413312), we get a palindrome (41474847414).

The spelling of 21331434102 in words is "twenty-one billion, three hundred thirty-one million, four hundred thirty-four thousand, one hundred two".