21102301356 has 72 divisors (see below), whose sum is σ = 51119686800. Its totient is φ = 6774964224.

The previous prime is 21102301351. The next prime is 21102301457. The reversal of 21102301356 is 65310320112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102301351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4528980 + ... + 4533636.

It is an arithmetic number, because the mean of its divisors is an integer number (709995650).

Almost surely, 2^21102301356 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21102301356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25559843400).

21102301356 is an abundant number, since it is smaller than the sum of its proper divisors (30017385444).

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

21102301356 is a wasteful number, since it uses less digits than its factorization.

21102301356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5171 (or 5140 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

Adding to 21102301356 its reverse (65310320112), we get a palindrome (86412621468).

The spelling of 21102301356 in words is "twenty-one billion, one hundred two million, three hundred one thousand, three hundred fifty-six".