21323211210 has 96 divisors (see below), whose sum is σ = 63487307520. Its totient is φ = 4864114944.

The previous prime is 21323211191. The next prime is 21323211229. The reversal of 21323211210 is 1211232312.

21323211210 is a `hidden beast` number, since 2 + 132 + 321 + 1 + 210 = 666.

It is an interprime number because it is at equal distance from previous prime (21323211191) and next prime (21323211229).

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 283246 + ... + 350534.

It is an arithmetic number, because the mean of its divisors is an integer number (661326120).

Almost surely, 2^21323211210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21323211210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31743653760).

21323211210 is an abundant number, since it is smaller than the sum of its proper divisors (42164096310).

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

21323211210 is a wasteful number, since it uses less digits than its factorization.

21323211210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67812 (or 67809 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21323211210 its reverse (1211232312), we get a palindrome (22534443522).

The spelling of 21323211210 in words is "twenty-one billion, three hundred twenty-three million, two hundred eleven thousand, two hundred ten".