21320232102 has 80 divisors (see below), whose sum is σ = 52153110240. Its totient is φ = 6470160768.

The previous prime is 21320232091. The next prime is 21320232121. The reversal of 21320232102 is 20123202312.

21320232102 is a `hidden beast` number, since 21 + 320 + 2 + 321 + 0 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 39 ways as a sum of consecutive naturals, for example, 84399 + ... + 223077.

It is an arithmetic number, because the mean of its divisors is an integer number (651913878).

Almost surely, 2^21320232102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21320232102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26076555120).

21320232102 is an abundant number, since it is smaller than the sum of its proper divisors (30832878138).

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

21320232102 is a wasteful number, since it uses less digits than its factorization.

21320232102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138779 (or 138770 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21320232102 its reverse (20123202312), we get a palindrome (41443434414).

The spelling of 21320232102 in words is "twenty-one billion, three hundred twenty million, two hundred thirty-two thousand, one hundred two".