21223332102 has 64 divisors (see below), whose sum is σ = 50446540800. Its totient is φ = 5823995520.

The previous prime is 21223332089. The next prime is 21223332103. The reversal of 21223332102 is 20123332212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223332103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 187024 + ... + 278252.

It is an arithmetic number, because the mean of its divisors is an integer number (788227200).

Almost surely, 2^21223332102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21223332102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25223270400).

21223332102 is an abundant number, since it is smaller than the sum of its proper divisors (29223208698).

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

21223332102 is a wasteful number, since it uses less digits than its factorization.

21223332102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91461.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21223332102 its reverse (20123332212), we get a palindrome (41346664314).

The spelling of 21223332102 in words is "twenty-one billion, two hundred twenty-three million, three hundred thirty-two thousand, one hundred two".