21101321214 has 48 divisors (see below), whose sum is σ = 47397888720. Its totient is φ = 6776609280.

The previous prime is 21101321203. The next prime is 21101321221. The reversal of 21101321214 is 41212310112.

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 (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 200494 + ... + 287054.

It is an arithmetic number, because the mean of its divisors is an integer number (987456015).

Almost surely, 2^21101321214 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21101321214, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23698944360).

21101321214 is an abundant number, since it is smaller than the sum of its proper divisors (26296567506).

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

21101321214 is a wasteful number, since it uses less digits than its factorization.

21101321214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87065 (or 87062 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21101321214 its reverse (41212310112), we get a palindrome (62313631326).

The spelling of 21101321214 in words is "twenty-one billion, one hundred one million, three hundred twenty-one thousand, two hundred fourteen".