21203230212 has 144 divisors (see below), whose sum is σ = 58855934592. Its totient is φ = 6408668160.

The previous prime is 21203230187. The next prime is 21203230219.

21203230212 is a `hidden beast` number, since 21 + 203 + 230 + 212 = 666.

21203230212 is nontrivially palindromic in base 10.

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 (21203230219) 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, 2327787 + ... + 2336877.

It is an arithmetic number, because the mean of its divisors is an integer number (408721768).

Almost surely, 2^21203230212 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 21203230212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29427967296).

21203230212 is an abundant number, since it is smaller than the sum of its proper divisors (37652704380).

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

21203230212 is a wasteful number, since it uses less digits than its factorization.

21203230212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9258 (or 9253 counting only the distinct ones).

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

The spelling of 21203230212 in words is "twenty-one billion, two hundred three million, two hundred thirty thousand, two hundred twelve".