21023212230 has 80 divisors (see below), whose sum is σ = 56565883440. Its totient is φ = 5602540608.

The previous prime is 21023212213. The next prime is 21023212267. The reversal of 21023212230 is 3221232012.

21023212230 is a `hidden beast` number, since 210 + 232 + 1 + 223 + 0 = 666.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1376697 + ... + 1391883.

It is an arithmetic number, because the mean of its divisors is an integer number (707073543).

Almost surely, 2^21023212230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21023212230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28282941720).

21023212230 is an abundant number, since it is smaller than the sum of its proper divisors (35542671210).

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

21023212230 is a wasteful number, since it uses less digits than its factorization.

21023212230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16915 (or 16906 counting only the distinct ones).

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

Adding to 21023212230 its reverse (3221232012), we get a palindrome (24244444242).

The spelling of 21023212230 in words is "twenty-one billion, twenty-three million, two hundred twelve thousand, two hundred thirty".