21023223210 has 96 divisors (see below), whose sum is σ = 59681187072. Its totient is φ = 5092122240.

The previous prime is 21023223197. The next prime is 21023223211. The reversal of 21023223210 is 1232232012.

21023223210 is a `hidden beast` number, since 21 + 0 + 2 + 322 + 321 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (21023223211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1216047 + ... + 1233213.

It is an arithmetic number, because the mean of its divisors is an integer number (621679032).

Almost surely, 2^21023223210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21023223210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29840593536).

21023223210 is an abundant number, since it is smaller than the sum of its proper divisors (38657963862).

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

21023223210 is a wasteful number, since it uses less digits than its factorization.

21023223210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18428 (or 18425 counting only the distinct ones).

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

Adding to 21023223210 its reverse (1232232012), we get a palindrome (22255455222).

The spelling of 21023223210 in words is "twenty-one billion, twenty-three million, two hundred twenty-three thousand, two hundred ten".