21230323212 has 48 divisors (see below), whose sum is σ = 56699992832. Its totient is φ = 6056614080.

The previous prime is 21230323207. The next prime is 21230323237. The reversal of 21230323212 is 21232303212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135658 + ... + 246705.

Almost surely, 2^21230323212 is an apocalyptic number.

It is an amenable number.

21230323212 is an abundant number, since it is smaller than the sum of its proper divisors (35469669620).

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

21230323212 is a wasteful number, since it uses less digits than its factorization.

21230323212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383038 (or 383036 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21230323212 its reverse (21232303212), we get a palindrome (42462626424).

The spelling of 21230323212 in words is "twenty-one billion, two hundred thirty million, three hundred twenty-three thousand, two hundred twelve".